Fatal error: Uncaught Error: Call to a member function loadFromExtension() on null in /home/bucereo/my_project_name/vendor/symfony/swiftmailer-bundle/Tests/DependencyInjection/Fixtures/config/php/spool.php:3 Stack trace: #0 {main} thrown in /home/bucereo/my_project_name/vendor/symfony/swiftmailer-bundle/Tests/DependencyInjection/Fixtures/config/php/spool.php on line 3