Notice: Undefined variable: loader in C:\wamp64\www\sviaticos\vendor\symfony\routing\Tests\Fixtures\validresource.php on line 5

Fatal error: Uncaught Error: Call to a member function import() on null in C:\wamp64\www\sviaticos\vendor\symfony\routing\Tests\Fixtures\validresource.php:5 Stack trace: #0 {main} thrown in C:\wamp64\www\sviaticos\vendor\symfony\routing\Tests\Fixtures\validresource.php on line 5