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Main Uddin is one of the pioneer blogger cum e-marketer from North East India(Assam).He is also a Skilled web Developer and regular columnist for various news portals around the globe.Read More

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Boom Your Email Marketing with top 10+ Free Services

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We love email marketing here at Perfect BloggersTech and few other popular blogs. It may not be the hippest, hottest method of driving traffic to your business but by gosh it works. However if it’s the early days of your company you may assume that email marketing is something you might do further down the line, once you have grown bigger than a fold up desk in your basement.

Boom Your Email Marketing with top 10+ Free Services

It doesn’t help that social media channels provide immediate gratification and with only a little determination can achieve growth with relative ease and speed. Plus social media channels are hip and hot. Therefore it’s very easy to let email marketing fall by the wayside. However according to Radicati, there are three times more email accounts then there are Facebook and Twitter accounts combined. 

According to Campaign Monitor open rates for email marketing is generally 20% - 30%. Your marketing message is five times more likely to be seen by email than on Facebook.  Click through rates from email are around 3%, while click through rates on tweets are roughly 0.5%. Therefore you’re six times more likely to get a click through from email than you are from Twitter.

According to our own Bridging the Gap in Email Marketing report email is also the second most trusted channel for customers to share information across. Therefore if you’re collecting data for more accurate targeting, email is the best method other than via your own website. Then again you need something to drive users to your site in the first place.

So there you go, email marketing is the tops. What if you think beautifully designed, responsive email marketing templates are too expensive? Here you go with few features-

1. Campaign Monitor

Mobile ready, with 10 available templates and a super quick template builder.

2. MailChimp

MailChimp offers a free service for sending up to 12,000 emails to 2,000 subscribers.
 

3. Zurb

Zurb has some fantastic and easily adaptable templates, all of which are responsive.

4. Litmus

Litmus is offering seven free email templates, each pre-tested and fully responsive.

5. Email on Acid

Email on Acid provides this free responsive template along with a blog post that explains the process clearly.

6. Pure360

Pure360 has lots of nice, clean looking templates, that are easy to use and includes a Pinterest integrated design.

7. Vertical Response

Offers a free service up to 1,000 contacts and 4,000 emails per month.

8. Active Campaign

An in-house team will design your email with your own branding for free. Although technically this is only available through a paid-plan.

9. Marketing Ship

There are hundreds of templates available here, each one free to adapt on site. You can send them to up to 3,000 contacts.

10. Promothon

Promothon offers more than 30 templates which all work with the major email clients.

11. Benchmark

Easily customisable templates, with decent support and full compatibility with all the major email clients.


For more details on the email marketing get Email Marketing Best Practice Guide, check out 50 epic email marketing blog posts on one handy page and seek out these in your own marketing strategies.
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Scam Review of RevenueHits adnetwork which produces huge malware and adware

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RevenueHits malware is a term used to describe the http://www.revenuehits.com/ advertisement service and malware contracted via http://revenuehits.com generated advertisements. RevenueHits.com is an unethical advertisement serving platform from Israel that displays malicious pop-up adverts, drop-down adverts, coupon adverts, pop-under adverts, and others. For this purpose, RevenueHits malware is categorized as adware and browser hijackerthat advertises and promotes the most common and unethical products, services, and websites in the world including search.conduit.com and the Conduit Toolbar, in which RevenueHits.com is aware of and takes no responsibility for.

Scam Review of RevenueHits adnetwork which produces huge malware and adware


Trapping by influential welcome message

More interestingly, the Israeli fraud stars gives influecial welcome message to webmasters such they are going to earn big from them but reality is zero or minus as installed website is marked as virus infected by Google or other search engines.


RevenueHits states that they “do not control, investigate, monitor or check such Web sites, we are not responsible for the computer programs available from, content in or opinions expressed at such Web sites” and follows that up with a disclaimer that claims “by visiting the Site (revenuethits.com, etc.), you agree that the laws of the state of Israel, without regard to principles of conflict of laws, will govern these Terms of Service” (can be seen as entrapment). While the unethical RevenueHits.com advertisements serving platform seems to get by scratch free with willingly harming many computer systems, confusing computer users, and targeting these users (etc.) by containing unethical lawful content in their Terms of Service, they are still seen as one of the worst advertisement serving companies in the world without regard, which may cause new internet laws to arise in the future.

Revenue Fraud Calculation: 

Further reports indicate that the malicious advertisement serving platform may lie to and scamwebmasters, website owners, publishers, and advertisers who seek to use the revenuehits.com advertisement network. In some cases, employees of RevenueHits.com (sometimes using fake names, fake websites, fake network, and masked information, etc.) and relating companies contacted legitimate third-party websites (likely unaware of revenuehits.com) in efforts to persuadevictims to place RevenueHits advertisements on their websites. In most cases, Revenuehits.com pleaded for webmasters to try out the service for a full week. The overall earnings at the end of the week has been reported to always be at 0.00 even though the websites had a large amount of impressions and clicks, labeling Revenuehits.com a scam and unsafe advertisement network for webmasters.

Revenuehits.com advertisements are not safe and have been reported to infect computer systems with unwanted malware including adware, browser hijackers, scareware, spyware, and even Trojan horses. Such malware may mask themselves or claim to be safe and legitimate software and tools for computer systems and internet browsers such as add-ons, extensions, and Toolbars likevGrabber Toolbar. If you notice advertisements appearing from revenuehits.com, it is recommended to avoid clicking the advertisement and possibly stay away from the website using the unsafe network. If you accidentally clicked a revenuehits.com advertisement your computer may be infected with unwanted malware.

Revenuehits.com advertisements commonly appear:

Revenuehits.com advertisement notoriously appear on media related websites, including torrent sites, streaming video sites, game sites, and others. Internet users who seek what may be concluded as illegal or copyright content online are often greeted by Revenuehits pop-up ads. Furthermore, Revenuehits.com advertisements may appear in the installment process of various software titles and in the interface of third-party software including p2p clients and third-party Toolbars.

Third-party toolbars have been noted to change existing internet browser settings, including the home page and default search engine in order to cause unwanted redirections to suspicious search engines and websites, including full-page advertisements or pop-ups that take up the entire computer screen or browser window and will not allow users to leave until a button is clicked or the page is bypassed by other means.

Dangers concerning RevenueHits advertisements and malware

RevenueHits is dangerous concerning the cyber criminal activity and the invasion of privacyrelating to credit theft, extortion, and identity theft. On a lesser-scale victims of RevenueHits malware have reported excessive amounts of email spam, unwelcome telephone calls from telemarketers, and junk mail, primarily related to recent computing and internet browser activity.



Information collected by RevenueHits and third-party malware may include usernames, passwords, bank account details, credit information, home addresses, telephone numbers, information concerning social media relationships, details about followers and friends in relation to social media accounts, your computer activity (downloads, updates, software opened, commands, chats), your browser activity (history, bookmarks, information manually submitted into forms and text fields, searches, purchases), email content, and in cases concerning a Trojan horse infection the malware or computer virus may access webcams and microphones connected to the infected computer system.
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Top 10+ Free Virtual Desktop Managers for Entrepreneurs and Marketers

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A virtual desktop manager lets you organize applications over several virtual desktops (also called ‘workspaces’). Virtual desktops are very common in Unix/Linux, and once you get accustomed to using them, they become an essential part of a productive workflow.These virtual desktop managers let you manage virtual desktops easily. All these virtual desktop software are completely free and can be downloaded to Windows PC. These virtual desktop software offer various features, like: create and manage multiple virtual desktops, set password for each desktop, switch between these virtual desktops using hotkeys or from system tray, run different programs on different desktops, can use different wallpaper for different desktops, drag and drop running applications from one desktop to another, and more. So, go through this list of free virtual desktop managers and see which ones you like the most.

1. 9Desks 

9Desks is a free virtual desktop manager. It lets you manage up to 9 different virtual desktops. You can set the password for each desktop excluding the first so no one can access it without password. You can drag and drop running applications from one desktop to another easily. You can easily switch between these desktops using hotkeys. You can add rules to automatically kill, move, maximize, minimize any application. Official Download Page

2. Dexpot 

Dexpot is a free virtual desktop manager for Windows. It lets you create and manage up to 20 virtual desktops. You can do different tasks on different desktops. You can double click on its tray icon to view all the desktops in one screen and for moving the running applications to other desktop. You can easily switch between these desktops. Official Download Page 

3. nSpaces 

nSpaces is a free software to create and manage virtual desktops. It terms them as workspaces. You can create as many spaces (virtual desktops) as you like. You can switch between these desktops by using hotkeys or from space switcher. You can run different programs on different desktops as you like. You can set different wallpapers for each desktop. You can set password also to use these workspaces. Official Download Page

4. SharpDesktop 

SharpDesktop is a free and very small virtual desktop software for Windows. It has 4 virtual desktops by default and you can increase them to 100 maximum. You can open different applications on different desktops. You can assign names to these desktops from configure menu. You can switch between these desktops by clicking on the desired desktop name or number from pages or by selecting the desired from system tray. Official  Download Page

5. Virtual Dimension 

Virtual Dimension is a free virtual desktop manager software. It lets you to use several desktops at the same time by creating multiple virtual desktops. You can add unlimited number of desktops. You can set different wallpaper on different desktops by configuring the settings. Open different applications on different desktops easily. It sits on the system tray and you can switch between desktops by right clicking on its icon. Official  Download Page

6. Desktops 
Desktops is a free virtual desktop manager software. It lets you to manage up to 4 virtual desktops. You can do different tasks at different desktops. You can switch between these 4 desktops by using its icon in system tray or by using its hotkey. It is very tiny in size. You have to logoff your system to close it. Official Download Page

7. Moo0 MultiDesktop 

Moo0 MultiDesktop is free virtual desktop manager software for Windows. It has 4 virtual desktops. You can open different applications on different desktops individually. You can change the desktop background image for each desktop separately. You can use hotkeys to switch between desktops. It is easy to install and uninstall. Official Download Page

8. VirtuaWin 

VirtuaWin is a small, free and easy to use virtual desktop manager for Windows. It lets you manage 4 virtual desktops by default and you can manage up to 20 desktops. It displays the small icon in the system tray. You can use hotkeys to browse between these virtual desktops. You can open different applications on different desktops individually. It also comes as a portable software.Here is the official Download Page

9. Blacksmith 

Blacksmith is a free virtual desktop manager. It lets you manage up to 6 virtual desktops on your PC. It is available in portable mode as it doesn’t require installation. It sits in the system tray and you can switch between these virtual desktops by choosing the desired desktop from the context menu. You can make windows transparent. It uses various keyboard shortcuts to operate and you can also change or assign shortcuts to any task. Official  Download Page

10. BetterDesktopTool 
BetterDesktopTool is a free software to create and manage virtual desktops. You can create and manage up to 64 virtual desktops. You can assign shortcut keys to switch between these desktops. You can open different applications or programs on different virtual desktops. You can make any application as global application to run on all desktops. It is highly customizable and you can apply or assign various shortcut keys for various tasks. Here is the official  Download Page

11. Microdesk 
Microdesk is a free virtual desktop manager. It lets you manage up to 99 virtual desktops. It creates a small transparent menu above system tray, which displays first 10 virtual desktops. You can use different wallpapers, icons, and password for different desktops. You can access these desktops via hotkeys or by clicking on the respective icon of the desired desktop. Official  Download Page

12. WindowsPager 

WindowsPager is a free desktop switcher/pager for Windows. It lets you manage 4 virtual desktops. You can move your running applications to any of the desktop. It requires no installation, just extract and run the program. It integrates with desktop panel and you can go to 1 of the 4 desktops by clicking the desired one icon. It is easy to use. Here is the official Download Page

13. VividDesktop 

VividDesktop is a simple and easy to use virtual desktop manager. By default it has only 2 desktops and you can increase them to any number of your choice. It sits in the system tray. You can switch between these desktops by right clicking on its icon and selecting the desired desktop. You can also use the hotkeys. Official  Download Page

14. Deskillusion 

Deskillusion is very small virtual desktop manager. You can create and use any number of virtual desktops. You can assign any key combination to switch between these desktops. You can also close all the open applications on current desktop using the shortcut keys. It comes in a ZIP format and doesn’t require installation. Here is the official  Download Page

15. Finestra Virtual Desktops 

Finestra Virtual Desktops is a free virtual desktop manager. It lets you create and manage any number of virtual desktops. You can switch between these desktops by using hotkeys or selecting the desired desktop from the context menu. You can configure hotkeys for accessing its various features. You can use different wallpaper on each desktop. Official  Download Page

16. JS Virtual Desktop Manager 

JS Virtual Desktop Manager is a simple and easy to use virtual desktop manager for Windows. It lets you create and manage any number of virtual desktops (by default it has 4 virtual desktops). You can switch between these desktops by using hotkeys or by clicking the icon near the system tray. You can send open windows to any other desktop. You can open different programs on different desktops. Here is the official Download Page

17. VirtualDesktop 

VirtualDesktop is a free software to manage 4 virtual desktops simultaneously. You can open different programs on different desktops. It is a lightweight program and is easy to use. It doesn’t have much options rather than four virtual desktops for working with different applications. It behaves like you have multiple monitors on your PC. Here is the official  Download Page

If I have missed an essential other top tools , must ping with comments for future updates of this collection. 
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Can Infolinks become an alternative of Google Adsense or any trustworthy PPC advertising network ?

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Actually I don't want to write Infolinks Review but their present activities have forced me to write a few line about them.Some web expert have already explained them as one of the Best Google Adsense Alternative but question arisen here How Infolinks is the best alternative of Google AdSense?

Can Infolinks become an alternative of Google Adsense or any trustworthy PPC advertising network ?

As we all know, when it comes to making money from a blog or website, Google Adsense is one of the best and fruitful blog monetization program. Most of the bloggers and webmasters give the first priority to Google Adsense for making money online. Even, if you have started your own blog then somehow you are also interested to make some decent money from Adsense.

But what you will do - If your Google Adsense Account isn't being Approval even after applying several times? Or

By any reason your existing Adsense Account gets disabled?

I know in these situations you will try Google AdSense alternatives to make money from your blog. I have experienced most of the bloggers get confused while selecting online advertising programs. If you are also one of them then I would assuredly suggest you to use Infolinks.

About Infolinks:

Infolinks is an online advertising platform which provides appropriate advertising products for the publishers, advertisers and brands. It is the bestGoogle Adsense alternative because it offers several attractive ad styles such asInFrame, InSearch, InTag and InText, which is not available with any other Website Advertising platform.


There are lots of Google Adsense alternatives available on web to monetize websites with different - different ad units but Infolinks made the top position among all of them by providing amazing facilities and easy to use features. Here are some of the best features of Infolinks ad network:
Amazing Features of Infolinks
Numerous speciality and comfortability are available to this ad Network, but here i am describing only the important features of Infolinks:

Very simple sign up procedure: 

Sign up process for Infolinks is quite simple from all other online advertising programs. With this ad network, you have to only enter few required details such as Name, Website link and password to Sign Up. 

Easy Approval process: Getting approval from the Infolinks ad network is very easier task. Infolinks will easily approve your request even if you are a new blogger.
Impressively compatible with Google Adsense: This is one of the bestadvantages of using Infolinks, you can freely use it with Google Adsense at the same time without any issue. So, no need to be worried if you use both ads on your website.
Decent Earnings: You will really get good amount of money for each click on the Infolinks ads and you will be paid for impressions on ads too. Undoubtedly, Infolinks pays much higher than all other alternatives ofAdSense.
Easily Customizable: It offers you the facilities to customize Infolinks ads according to your wish. So, it depends on you which type of ads you want to display on your blog. Adding colour combination on ads is also much simpler.
Search engine optimization (SEO): Many ad networks affect your blog SEO, but with Infolinks the condition is quite different. Infolinks ad does not hamper your blog SEO in any condition.
Page load times: Any bloggers can't compromise with their page load time, all want to load their website fast. But with Infolinks ad network you can blindly trust, even its ad loads just after your website gets fully loaded.

I hope these above mentioned features are quite enough to know about the usefulness of Infolinks. Here is their new video with features and description.



Additional Details of Infolinks:
With this online advertising program you haven't to wait for a long time to get paid, the Minimum Payment Threshold of Infolinks is $50. So as you reach at the level of your minimum payment threshold, you can request to get paid.

While with other Adsense alternatives you will have to wait for a long time. Even, the minimum payment threshold of Google Adsense is $100, so you can think how much useful is the use of Infolinks.

Thus, after seeing these amazing features and easiness of Infolinks we can confirmly say that Infolinks is the best Google Adsense alternative. So why you are waiting, click on the below given link to Sign Up right now.

Go from here: Sign Up for InfoLinks

Don’t forget to share your thought via the comments - Do you think Infolinks is the Best Google Adsense alternative?
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Free On Line Training to Improve your career prospects and earnings potential

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Whatever your background, situation or requirements, we can train you to become an IT professional leaving you with the skills, confidence and practical experience to make it in the real world of IT.
 Main Uddin Bloggers Guru cum Marketing expert

Free On Line Training is offered by Main Uddin with the direct patronization of the Focus A-Z Entertainment Private Limited. So, easily any one can Improve your career prospects and earnings potential.

This is a completely free system that offers you flexibility and choice without any long-term commitments. Designed to increase access to online learning provision, the site offers an ever growing list of course titles covering many topics.

You’ll do your learning online so all you need is access to the internet. This means you can learn at a time, place and pace to suit you.

Anyone can learn on “Free-Online-Training-Courses” for free.

What do you have to lose? Start Learning Today.

This free training course contains three separate modules.

  1. Tutorial 1 is What Is The Internet.
  2. The first lesson is “What Is The Internet“.
  3. The second lesson is “How Do Web Browsers Work”.
  4. The third lesson is “What Is HTTP?”.
  5. The fourth lesson is “Web Server Responses”.

Tutorial 2 is Creating Websites With HTML.

  1. The first lesson is “Introduction To HTML“.
  2. The second lesson is “Viewing Website HTML in our Browsers”.
  3. The third lesson is “Creating Our First HTML Document”.
  4. The fourth lesson is “Understanding Basic HTML”.
  5. The fifth lesson is “Adding Text To Our HTML Page”.
  6. The sixth lesson is “Adding Links and Images in HTML”.
  7. The seventh lesson is “How To Add Navigation To A Simple HTML Page”.
  8. The eight lesson is “Class, ID, Div and Span in HTML”.
  9. The ninth lesson is “How Are Complex HTML Websites Created”.
  10. Tutorial 3 is Cascading Style Sheets.

The first lesson is “What Is CSS?”.

  1. The second lesson is “Understanding CSS Selectors”.
  2. The third lesson is “Simple CSS Styles For Text”.
  3. The forth lesson is “Padding, Border And Margin In CSS”.
  4. The fifth lesson is “Loading External CSS Files Using The Tag”.
  5. The sixth lesson is “More Advanced CSS”.
  6. This is a total of 19 lessons.

How to Enrol

Enter your name and email address, then press “Enrol Me”. You will then be sent links to these lessons on a regular basis. When you have completed this course to will be sent updates on new courses, all of which will be free. 

Name:
Email:
Mobile/phone:
Subject: Asking course 


Worried about your e-mail being used to sell you stuff? Don’t be, we have nothing to sell. Everything, lessons and courses, are Free Free Free.

If you want to stop receiving further new course information, simply click the link marked “unsubscribe” at the bottom of the e-mail and your details will be deleted from our database.
For further information please read our Privacy Policy
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Top 10 WordPress Related Errors For Bloggers and Entrepreneurs

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If you are a WordPress user who likes to get your hands dirty with the codes, or one who just loves installing plug-ins and changing themes, you’ll understand that encountering an error is an inevitable occurrence. WordPress users (like us) know how frustrating it is to stumble into an unexpected error and not be able to find a solution for it. Most WordPress problems are solvable; If you hit an error, don’t fret because chances are, some other WordPress user had the same problem and had already gotten it solved.


In today’s post, we take a look at some of the most common WordPress errors users have encountered, and share with you the solutions to fix those problems or make them go away. We hope this will comes in handy for you – happy WordPressing!

1. Lost Admin Password & Email Retrieval Is Not Functioning

The problem:

You lost your WordPress admin password, and have tried to enter your username or email address in the “Lost your password?” page but failed to receive any link to create a new password via email.


Here are 2 simple solutions to reset your WordPress admin password.
Solution 1: phpMyAdmin
Login cPanel, click on phpMyAdmin under Databases.

Select your WordPress database. For example: Username_wrdp1.
Go to wp_users, click on Browse.

Look for your Username and click Edit.

Reset your password by inserting a new value into user_pass. Remember, it is case-sensitive.

Once you completed this, click the dropdown menu under Function, and choose MD5 from the menu.
At the bottom of the page, click the Go button.
Solution 2: Via FTP
Login your FTP account.
Go to “../wp-content/themes/(your active theme)/”, download thefunctions.php file.

Open functions.php and add the code below right after the first <?php:

wp_set_password('YourNewPassword',1);

Replace YourNewPassword with your desired new password. The “1” in the script is the user ID number in the wp_users table.
Upload the edited functions.php file to your FTP.
Remove the code and upload to your FTP after you’re able to login WordPress.
2. WordPress admin dashboard is not displaying properly

The problem:

The WordPress admin dashboard is displaying without CSS. All the links are not arranged properly.

Solution 1: Proxy & Firewall

Check if your Internet connection is behind a proxy connection or firewall. Some of these tools are blocking CSS files making CSS files to not load properly. Try to clear your proxy or firewall cookies and cache, and press Ctrl + F5 to refresh your page.
Solution 2: Upgrade WordPress Plugins

If you have any WordPress plugins installed for the admin menu such as ‘Admin Drop Down Menu’ plugin or ‘Lighter Menus’ plugin, upgrade it. If it doesn’t work, try to deactivate it.
3. Warning: Cannot modify header information – headers already sent by

The problem:

You receive an error message on your browser “Warning: Cannot modify header information – headers already sent by (output started at /path/blog/wp-config.php:34)” right after upgrading your WordPress or a new WordPress installation.
Solution: Remove spaces, new lines, or other garbage in wp-config.php
Download wp-config.php via FTP.
Open wp-config.php.
Remove all spaces before <?php.
Make sure the first characters are <?php, placed at the first line with no space in between.

Remove all spaces after ?>
Make sure the last characters are ?>, placed at the last line with no space in between.


This error could happen on other files too. Read the error message carefully as it states the specific file name where the error occurred.
4. WordPress blog and admin Is showing blank page

The problem:

This error normally happens right after a new WordPress Themes installation or WordPress upgrade. The entire blog is showing a blank page; so is the WordPress admin login page. There’s no way to access the dashboard.

Solution 1: Rename current installed theme folder via FTP

Renaming the currently installed theme folder via FTP can force WordPress to choose the default theme to be put into service and you’re able to access WordPress wp-admin after that.
Navigate to the wp-contents/themes directory via FTP.

Rename current installed theme folder. For example: “twentytwenty” to “twentytwenty-temp”.

Login to your WordPress wp-admin.
Check if your theme is compatible with your version of WordPress.
Check if your theme contains coding which can’t be executed.
Solution 2: Reset plugin folder via FTP
Navigate to the wp-contents directory via FTP.
Rename plugins folder to “plugins-temp”.

Create a new folder called “plugins” at wp-contents.
Try to login to your WordPress wp-admin.
Move your plugin from “plugins-temp” to “plugin” and activate them one by one.
Check if any plugin is not compatible with your version of WordPress.
5. Fatal error: Allowed memory size of 33554432 bytes exhausted

The problem:

Receive “Fatal error: Allowed memory size of 33554432 bytes exhausted” when try to upload an image with medium file size. To solve this error, try to increase the memory allocated to PHP. You can set the limit to 32MB, 64MB, 128MB or 256MB. It depends on your host.
Solution 1: Edit PHP.ini

If you’re still allowed to edit your PHP.inifile, update your memory_limit in PHP.ini by modifying the below line

memory_limit = 64M ; Maximum amount of memory a script may consume (64MB)

If the line is showing 64M in default, try 128M.
Solution 2: Edit .htaccess file

Add the script below to your .htaccess file.

php_value memory_limit 64M
Solution 3: Edit wp-config.php file

Add the script below to your wp-config.php file

Increasing memory allocated to PHP define('WP_MEMORY_LIMIT', '64M');
Solution 4: Create a PHP.ini file to wp-admin folder
Open Notepad.
Insert the following code into Notepad.memory_limit = 64M ;
Save as “PHP.ini”.
Upload this file to “wp-admin” directory.
6. You are not authorized to view this page (403 error)

The problem:

You receive an error message “You are not authorized to view this page. (403 error)” after inserting the username and password in the WordPress admin login page.

Solution: Enable Index.php

If your blog is hosted on a Windows server, this could be an error with Directory Indexes.
Login to the Control Panel.
Click on Web Options.
Go to Directory Indexes section.
Add index.php to the Directory Indexes.
7. Fatal error undefined function is_network_admin()

The problem:

You receive “Fatal error undefined function is_network_admin()” when you login to WordPress admin after updating WordPress.
Solution: Manual Update

This error is caused by a fail WordPress version upgrade. Try a manual update.
Download the latest WordPress zip file and unzip it.
Back up your WordPress.
Rename wp-includes and wp-admin directories to wp-includes.bak andwp-admin.bak.
Upload the wp-includesand wp-admin directories from unzipped folder to your web host via FTP.
Upload files from new wp-content to your existing wp-content folder. Replace and overwrite existing files.
Upload the new version of the rest of files from the root directory to your existing WordPress root directory.
Remove .maintenance at your WordPress directory via FTP.
Login to WordPress admin and you will be given a link to URL like “http://domain.com/wordpress/wp-admin/upgrade.php”. Follow the link and instructions.
Clear your cache to see the changes if you have caching enabled.

For more details about WordPress manual update, read http://codex.wordpress.org/Updating_WordPress#Manual_Update.
8. WordPress Admin Login 404 Issue

The problem:

You’re not able to login to WordPress admin. You receive a 404 error page instead.
Solution 1: Update the URL in database

If you’re able to access phpMyAdmin, try to update the URL in the database.
Login cPanel, click on phpMyAdmin under Databases.

Select your WordPress database. For example: Username_wrdp1.
Go to wp_options, click on Browse.

Search for siteurl under the field option_name.
Click on Edit Field.

Change the URL in the input box of option_value.

At the bottom of page, click the Go button.
Solution 2: Update Folder Attributes
Go to “/wp-admin” directory via FTP.
Right click on wp-admin directory and click on File Attributes.
Update the value to 755 and check Recurse into subdirectories if there’s an option.

Click OK.
Repeat step 1 to step 4 for /wp-content and wp-includes.
Open your web browser and try to login to WordPress admin. Press Ctrl + F5 to clear cache.
9. “Briefly unavailable for scheduled maintenance” message remainins after an automatic upgrade

The problem:

Your WordPress site is showing “Briefly unavailable for scheduled maintenance” after an automatic upgrade has completed.

Solution: Remove .maintenance file

A file named .maintenance is placed by WordPress during an automatic upgrade to notify visitors that the site in under a short maintenance. If an upgrade fails or is corrupted, the file will remain in the WordPress folder and won’t get deleted.

To remove .maintenance file,
Access your blog root directory via FTP.
Locate the file .maintenance.

Remove the .maintenance file from the blog root directory.

Once you solve this problem, you may want to run the WordPress automatic upgrade again.
10. Can’t delete a plugin

The problem:

You’re not able to delete a plugin in WordPress admin. It still appears even after you have deleted the directory via FTP.
Solution: Delete plugin via Secure Shell (SSH)

Your plugin might had uploaded some hidden/nested files inside the plugin directory which didn’t appear in FTP.

If you have SSH access to your blog,
Login your site via SSH.
Use SSH commands to nagivate “../wp-content/plugins/”.
Use ls -al to see the full list of folders.

Delete the particular plugin folder with rm (Folder Name).

Have comments you want to share abou the errors and solutions above? Share them below.
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