Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Kernel' not found in /home/bucereo/my_project_name/vendor/sensio/framework-extra-bundle/Tests/Fixtures/TestKernel.php:20 Stack trace: #0 {main} thrown in /home/bucereo/my_project_name/vendor/sensio/framework-extra-bundle/Tests/Fixtures/TestKernel.php on line 20