Fatal error: Uncaught Error: Class 'Symfony\Component\VarDumper\Cloner\AbstractCloner' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\var-dumper\Cloner\VarCloner.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\var-dumper\Cloner\VarCloner.php on line 17