How to resolve an error in advanced-cache.php

If you activate 2 caching plugins (or at least the functionality) at the same time, this might cause a fatal error and break your site.

Follow these instructions to recover your site:

• Connect to your server via FTP (or an other way if you prefer).
• Browse to the root of the WordPress installation, where you should have a file named wp-config.php.
• Download this file and open it in a text editor, such as notepad (Windows) or textedit (Mac).
• Locate the line define('WP_CACHE', true);, delete it, save the file and upload it back via FTP.
• Then still via FTP, enter the folder wp-content and delete the file advanced-cache.php
• You should now be able to reconnect to your administration.
• Go to one or all of your caching plugins settings, and only keep 1 activated.

If the error comes back before you had a chance to do this:

• Try the first part again, and before going to the admin, do the following:
• Using FTP, browse to the folder wp-content/plugins,and rename the folders of all caching plugins (for example by adding a -).
• Then go to Plugins in your administration, and make sure the cache plugins are deactivated.
• Using FTP, browse to the folder wp-content/plugins, and rename the folders of all caching plugins back to their original names.
• You can now reactivate the caching plugin of your choice.