Fatal error: Uncaught Error: Class "Grpc\Channel" not found in /var/www/usonboard.com/grpc/src/php/tests/MemoryLeakTest/MemoryLeakTest.php:50 Stack trace: #0 {main} thrown in /var/www/usonboard.com/grpc/src/php/tests/MemoryLeakTest/MemoryLeakTest.php on line 50