1: Clear your browser’s cache

Sometime it does works to clear your browser’s cache. If that doesn’t work, you can try clearing your cookies as well.

2: PHP Memory Limit Reached

If have reached your PHP memory limit, you’ll get this kind of error.
Solution 1:-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.

Solution 2:- Edit wp-config.php file

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


define(‘WP_MEMORY_LIMIT’, ’64M’);


3. Revert to the Default Theme

{i}Try to activate the default WordPress theme if you’re using one you selected from the Theme Repository.

{ii} Rename your theme’s folder under /wp-content/themes/your-theme/ to manually deactivate it temporarily.

4. Delete or Deactivate Plugins
{i} you can check if any plugins you’re using are the cause of the error.Then please rename the plugin folder.
you can DO IT using FTP, SSH or cPanel to rename the folders you find under /wp-content/plugins/YOUR-PLUGIN