Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/kacperg/public_html/kacpergr/wp-content/plugins/modula-best-grid-gallery/includes/uninstall/class-modula-uninstall.php:13 Stack trace: #0 /home/kacperg/public_html/kacpergr/wp-content/plugins/modula-best-grid-gallery/includes/uninstall/class-modula-uninstall.php(217): Modula_Uninstall->__construct() #1 {main} thrown in /home/kacperg/public_html/kacpergr/wp-content/plugins/modula-best-grid-gallery/includes/uninstall/class-modula-uninstall.php on line 13