Fatal error: Uncaught Error: Class "Symfony\Component\VarDumper\Caster\ConstStub" not found in C:\WebServer\htdocs\bookshelf\vendor\symfony\var-dumper\Caster\LinkStub.php:19 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\symfony\var-dumper\Caster\LinkStub.php on line 19