相关疑难解决方法(0)

尝试调用存根方法时出现以下错误。知道是什么原因造成的吗？

[bolt.api.handlers] 2019-08-21 20:07:57,792 ERROR handlers:1066: 'ResourceHandler' object has no attribute 'ontology_service_handler'
Traceback (most recent call last):
  File "/bolt-webserver/bolt/api/onse/onse_handlers/ontology_service.py", line 17, in post
    ontology_id = await self.onse_stub.createOntology()
  File "/bolt-webserver/bolt/api/onse/onse_stub.py", line 41, in createOntology
    return self.stub.CreateOntology(ontology_messages_pb2.Ontology())
  File "/usr/local/lib/python3.6/site-packages/grpc/_channel.py", line 565, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "/usr/local/lib/python3.6/site-packages/grpc/_channel.py", line 467, in _end_unary_response_blocking
    raise _Rendezvous(state, None, None, deadline)
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
        status = StatusCode.UNAVAILABLE
        details = "failed to connect to all addresses"
        debug_error_string = "{"created":"@1566418077.791002345","description":"Failed to pick …