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