"StatusCode.RESOURCE_EXHAUSTED has type StatusCode, but expected one of: int, long"

Summary

This job has failed: https://gitlab.com/BuildStream/buildstream/-/jobs/149530767

With gRPC error:

<_Rendezvous of RPC that terminated with:
    	status = StatusCode.UNKNOWN
    	details = "Exception calling application: <StatusCode.RESOURCE_EXHAUSTED: (8, 'resource exhausted')> has type StatusCode, but expected one of: int, long"
    	debug_error_string = "{"created":"@1548183434.373545620","description":"Error received from peer","file":"src/core/lib/surface/call.cc","file_line":1036,"grpc_message":"Exception calling application: <StatusCode.RESOURCE_EXHAUSTED: (8, 'resource exhausted')> has type StatusCode, but expected one of: int, long","grpc_status":2}"
    >

What is the current bug behavior?

What is the expected correct behavior?

Relevant logs and/or screenshots

Possible fixes

Other relevant information

• BuildStream version affected: /milestone %BuildStream_v1.x

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