Clear Cache After Activate/Deactivate a Plugin
When you activate or deactivate a plugin, you might ask for the entire cache to be cleared.
In this case, you need to add the following lines to the wp-config.php file because this feature is not automatically activated. You have to activate it manually.
You need to add the following lines after <?php which exists at the top of wp-config.php file.
define("WPFC_CLEAR_CACHE_AFTER_ACTIVATE_DEACTIVATE_PLUGIN", true);