Fatal error: Uncaught Error: Class 'Symfony\Component\VarDumper\Cloner\Stub' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\var-dumper\Caster\ConstStub.php:21 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\var-dumper\Caster\ConstStub.php on line 21