Fatal error: Uncaught Error: Interface 'Whoops\Handler\HandlerInterface' not found in D:\xampp\htdocs\psp\backend\vendor\filp\whoops\src\Whoops\Handler\Handler.php:15 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\filp\whoops\src\Whoops\Handler\Handler.php on line 15