hyperledger/fabric · error

expected QueryResult of either ConfigResult or Error but got

Error message

expected QueryResult of either ConfigResult or Error but got %v instead

What it means

mapConfig indexed a discovery response result that is neither a ConfigResult nor an Error payload — the peer returned an unexpected QueryResult oneof variant for a config query, indicating a version/protocol mismatch with the discovery service.

Source

Thrown at discovery/client/client.go:368

			err = resp.mapEndorsers(channel2index, r, req.invocationChainMapping)
		case protoext.PeerMembershipQueryType:
			err = resp.mapPeerMembership(channel2index, r, protoext.PeerMembershipQueryType)
		case protoext.LocalMembershipQueryType:
			err = resp.mapPeerMembership(channel2index, r, protoext.LocalMembershipQueryType)
		}
		if err != nil {
			return nil, err
		}
	}

	return resp, err
}

func (resp response) mapConfig(channel2index map[string]int, r *discovery.Response) error {
	for ch, index := range channel2index {
		config, err := protoext.ResponseConfigAt(r, index)
		if config == nil && err == nil {
			return errors.Errorf("expected QueryResult of either ConfigResult or Error but got %v instead", r.Results[index])
		}
		key := key{
			queryType: protoext.ConfigQueryType,
			k:         ch,
		}

		if err != nil {
			resp[key] = errors.New(err.Content)
			continue
		}

		resp[key] = config
	}
	return nil
}

func (resp response) mapPeerMembership(key2Index map[string]int, r *discovery.Response, qt protoext.QueryType) error {
	for k, index := range key2Index {

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Use a discovery client version matching the peer's discovery service
2. Inspect r.Results[index] to identify the unexpected variant

When it happens

Trigger: Thrown at discovery/client/client.go:368 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/abce0b4985638aab. Report an issue: GitHub.