Fatal error: Uncaught Error: Interface "GuzzleHttp\MessageFormatterInterface" not found in /users/energydata/www/volkszaehler.org/vendor/guzzlehttp/guzzle/src/MessageFormatter.php:38 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/guzzlehttp/guzzle/src/MessageFormatter.php on line 38