Fatal error: Uncaught Error: Class "ProjectExtension" not found in /home/trpdev/public_html/vendor/symfony/dependency-injection/Tests/Fixtures/includes/ProjectWithXsdExtension.php:3 Stack trace: #0 {main} thrown in /home/trpdev/public_html/vendor/symfony/dependency-injection/Tests/Fixtures/includes/ProjectWithXsdExtension.php on line 3