hyperledger/fabric · error

error unmarshalling Block

Error message

error unmarshalling Block

What it means

UnmarshalBlock wraps a proto.Unmarshal failure: the encoded bytes are not a valid protobuf-encoded common.Block (empty, truncated, or different message type). Callers inspecting blocks from envelopes or files rely on this to reject malformed data.

Source

Thrown at protoutil/unmarshalers.go:26

import (
	"github.com/hyperledger/fabric-protos-go-apiv2/common"
	"github.com/hyperledger/fabric-protos-go-apiv2/ledger/rwset"
	"github.com/hyperledger/fabric-protos-go-apiv2/ledger/rwset/kvrwset"
	"github.com/hyperledger/fabric-protos-go-apiv2/msp"
	"github.com/hyperledger/fabric-protos-go-apiv2/peer"
	"github.com/pkg/errors"
	"google.golang.org/protobuf/proto"
)

// the implicit contract of all these unmarshalers is that they
// will return a non-nil pointer whenever the error is nil

// UnmarshalBlock unmarshals bytes to a Block
func UnmarshalBlock(encoded []byte) (*common.Block, error) {
	block := &common.Block{}
	err := proto.Unmarshal(encoded, block)
	return block, errors.Wrap(err, "error unmarshalling Block")
}

// UnmarshalChaincodeDeploymentSpec unmarshals bytes to a ChaincodeDeploymentSpec
func UnmarshalChaincodeDeploymentSpec(code []byte) (*peer.ChaincodeDeploymentSpec, error) {
	cds := &peer.ChaincodeDeploymentSpec{}
	err := proto.Unmarshal(code, cds)
	return cds, errors.Wrap(err, "error unmarshalling ChaincodeDeploymentSpec")
}

// UnmarshalChaincodeInvocationSpec unmarshals bytes to a ChaincodeInvocationSpec
func UnmarshalChaincodeInvocationSpec(encoded []byte) (*peer.ChaincodeInvocationSpec, error) {
	cis := &peer.ChaincodeInvocationSpec{}
	err := proto.Unmarshal(encoded, cis)
	return cis, errors.Wrap(err, "error unmarshalling ChaincodeInvocationSpec")
}

// UnmarshalPayload unmarshals bytes to a Payload
func UnmarshalPayload(encoded []byte) (*common.Payload, error) {

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Verify the byte slice is a complete, uncorrupted block payload
2. Check the producer/consumer agree on the Fabric protobuf versions

When it happens

Trigger: Thrown at protoutil/unmarshalers.go:26 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/680973bbf87b5eba. Report an issue: GitHub.