Fatal error: Uncaught Error: Class "Google\Cloud\PubSub\PubSubClient" not found in /home/ondemand/test.ondemandpro.net/php-docs-samples/pubsub/api/src/pubsub_client.php:38 Stack trace: #0 {main} thrown in /home/ondemand/test.ondemandpro.net/php-docs-samples/pubsub/api/src/pubsub_client.php on line 38