Fatal error: Uncaught Error: Call to undefined function RSSSL\Pro\Security\WordPress\add_filter() in E:\www\web\wp-content\plugins\really-simple-ssl\security\wordpress\class-rsssl-simple-404-interceptor.php:12 Stack trace: #0 E:\www\web\wp-content\plugins\really-simple-ssl\security\wordpress\class-rsssl-simple-404-interceptor.php(128): RSSSL\Pro\Security\WordPress\Rsssl_Simple_404_Interceptor->__construct() #1 {main} thrown in E:\www\web\wp-content\plugins\really-simple-ssl\security\wordpress\class-rsssl-simple-404-interceptor.php on line 12