Fatal error: Uncaught Error: Interface 'Symfony\Component\Config\Resource\SelfCheckingResourceInterface' not found in /home/itscm/dev.its.cm/webserivesits/vendor/symfony/config/Resource/ComposerResource.php:21 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webserivesits/vendor/symfony/config/Resource/ComposerResource.php on line 21