Notice: Undefined variable: loader in E:\xampp\htdocs\vendor\symfony\routing\Tests\Fixtures\validresource.php on line 5

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