Fatal error: Uncaught Error: Interface "Symfony\Contracts\Cache\ItemInterface" not found in /users/energydata/www/volkszaehler.org/vendor/symfony/cache/CacheItem.php:22 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/symfony/cache/CacheItem.php on line 22