Fatal error: Uncaught Error: Interface "Psr\Cache\CacheItemInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/doctrine/cache/lib/Doctrine/Common/Cache/Psr6/CacheItem.php:18 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/doctrine/cache/lib/Doctrine/Common/Cache/Psr6/CacheItem.php on line 18