Fatal error: Uncaught Error: Interface 'Google\ApiCore\ServerStreamingCallInterface' not found in /home/opcon/src/composer/vendor/google/gax/src/Transport/Grpc/ServerStreamingCallWrapper.php:46 Stack trace: #0 {main} thrown in /home/opcon/src/composer/vendor/google/gax/src/Transport/Grpc/ServerStreamingCallWrapper.php on line 46