hyperledger/fabric · error

nil channel group

Error message

nil channel group

What it means

Returned by NewValidatorImpl when the config is non-nil but its ChannelGroup is nil. The channel group is the root of the config tree; without it there is nothing to validate, so construction of the validator aborts.

Source

Thrown at common/configtx/validator.go:108

	}

	// Illegal characters
	matched := re.FindString(channelID)
	if len(matched) != len(channelID) {
		return errors.Errorf("'%s' contains illegal characters", channelID)
	}

	return nil
}

// NewValidatorImpl constructs a new implementation of the Validator interface.
func NewValidatorImpl(channelID string, config *cb.Config, namespace string, pm policies.Manager) (*ValidatorImpl, error) {
	if config == nil {
		return nil, errors.Errorf("nil config parameter")
	}

	if config.ChannelGroup == nil {
		return nil, errors.Errorf("nil channel group")
	}

	if err := ValidateChannelID(channelID); err != nil {
		return nil, errors.Errorf("bad channel ID: %s", err)
	}

	configMap, err := mapConfig(config.ChannelGroup, namespace)
	if err != nil {
		return nil, errors.Errorf("error converting config to map: %s", err)
	}

	return &ValidatorImpl{
		namespace:   namespace,
		pm:          pm,
		sequence:    config.Sequence,
		configMap:   configMap,
		channelID:   channelID,
		configProto: config,

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Ensure the config was built with a populated channel group
2. Rebuild the config from a valid profile or config envelope

When it happens

Trigger: Thrown at common/configtx/validator.go:108 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/a63564f6def09c3c. Report an issue: GitHub.