I was trying this plugin in order to try to insert a content locker that could vary from post to post. (I'm starting to begin this is not the point of the plugin);
But, anyways, once I installed it, the content disappears from the post. I've tried to deactivate it, uninstall, install it again.. and nothing.
When I debug it, this message persists:
"Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'add_post_content' not found or invalid function name in /var/www/vhosts/gentlefantasies.com/httpdocs/wp-includes/plugin.php on line 173"
What can it be?