Fatal error: Uncaught Error: Interface "Ratchet\Wamp\WampServerInterface" not found in /users/energydata/www/volkszaehler.org/vendor/cboden/ratchet/tests/helpers/Ratchet/Mock/WampComponent.php:7 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/cboden/ratchet/tests/helpers/Ratchet/Mock/WampComponent.php on line 7