Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\Messaging\Renderer\FlashMessageRendererInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Messaging/Renderer/BootstrapRenderer.php:32 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Messaging/Renderer/BootstrapRenderer.php on line 32