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