Fatal error: Uncaught Error: Interface 'Symfony\Component\CssSelector\Parser\Handler\HandlerInterface' not found in C:\xampp\htdocs\admin\vendor\symfony\css-selector\Parser\Handler\WhitespaceHandler.php:28 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\css-selector\Parser\Handler\WhitespaceHandler.php on line 28