Fatal error: Uncaught Error: Call to undefined function add_filter() in /public_html/apartamenty/wp-config.php:91 Stack trace: #0 /public_html/apartamenty/wp-load.php(50): require_once() #1 /public_html/apartamenty/wp-blog-header.php(13): require_once('/public_html/ap...') #2 /public_html/apartamenty/index.php(17): require('/public_html/ap...') #3 {main} thrown in /public_html/apartamenty/wp-config.php on line 91