hyperledger/fabric · error

failed unmarshalling configuration file at [%s]

Error message

failed unmarshalling configuration file at [%s]

What it means

getMspConfig: the MSP config.yaml was read but yaml.Unmarshal into the Configuration struct failed, i.e., the file is not valid YAML or its fields do not match the expected schema (OrganizationalUnitIdentifiers, NodeOUs, etc.).

Source

Thrown at msp/configbuilder.go:278

	// Load configuration file
	// if the configuration file is there then load it
	// otherwise skip it
	var ouis []*msp.FabricOUIdentifier
	var nodeOUs *msp.FabricNodeOUs
	_, err = os.Stat(configFile)
	if err == nil {
		// load the file, if there is a failure in loading it then
		// return an error
		raw, err := os.ReadFile(configFile)
		if err != nil {
			return nil, errors.Wrapf(err, "failed loading configuration file at [%s]", configFile)
		}

		configuration := Configuration{}
		err = yaml.Unmarshal(raw, &configuration)
		if err != nil {
			return nil, errors.Wrapf(err, "failed unmarshalling configuration file at [%s]", configFile)
		}

		// Prepare OrganizationalUnitIdentifiers
		if len(configuration.OrganizationalUnitIdentifiers) > 0 {
			for _, ouID := range configuration.OrganizationalUnitIdentifiers {
				f := filepath.Join(dir, ouID.Certificate)
				raw, err = readFile(f)
				if err != nil {
					return nil, errors.Wrapf(err, "failed loading OrganizationalUnit certificate at [%s]", f)
				}

				oui := &msp.FabricOUIdentifier{
					Certificate:                  raw,
					OrganizationalUnitIdentifier: ouID.OrganizationalUnitIdentifier,
				}
				ouis = append(ouis, oui)
			}
		}

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Validate the file's YAML syntax
2. Correct field names/types to match the MSP Configuration schema
3. Check for tabs or structural mistakes breaking unmarshalling

When it happens

Trigger: Thrown at msp/configbuilder.go:278 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/8c91ff394be56253. Report an issue: GitHub.