grpc._channel._MultiThreadedRendezvous: <_MultiThreadedRendezvous of RPC that terminated with:
 status = StatusCode.UNKNOWN
 details = "Exception iterating responses: generator didn't yield"
 debug_error_string = "{"created":"@1609424052.213181825","description":"Error received from peer ipv4:10.0.6.6:9000","file":"src/core/lib/surface/call.cc","file_line":1062,"grpc_message":"Exception iterating responses: generator didn't yield","grpc_status":2}"