Fatal error: Uncaught Error: Interface 'Symfony\Component\Config\Resource\SelfCheckingResourceInterface' not found in /home/gcpsxdwf/public_html/forum.oandplibrary.org/vendor/symfony/config/Resource/ComposerResource.php:21 Stack trace: #0 {main} thrown in /home/gcpsxdwf/public_html/forum.oandplibrary.org/vendor/symfony/config/Resource/ComposerResource.php on line 21