Fatal error: Uncaught Error: Call to undefined function add_filter() in /users/robiniffert95/www/gustavguns/wp-content/plugins/custom-twitter-feeds/inc/admin-hooks.php:2 Stack trace: #0 {main} thrown in /users/robiniffert95/www/gustavguns/wp-content/plugins/custom-twitter-feeds/inc/admin-hooks.php on line 2