Fatal error: Uncaught Error: Interface "Psr\Http\Server\MiddlewareInterface" not found in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-backend/Classes/Middleware/BackendModuleValidator.php:51 Stack trace: #0 {main} thrown in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-backend/Classes/Middleware/BackendModuleValidator.php on line 51