Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "_404" not found in /home/u958331791/domains/arifsultani291.digital/public_html/udemyclone/app/core/app.php:37 Stack trace: #0 /home/u958331791/domains/arifsultani291.digital/public_html/udemyclone/public/index.php(7): App->__construct() #1 {main} thrown in /home/u958331791/domains/arifsultani291.digital/public_html/udemyclone/app/core/app.php on line 37