hyperledger/fabric · error

The required parameter 'channelID' is empty. Rerun the comma

Error message

The required parameter 'channelID' is empty. Rerun the command with -C flag

What it means

The peer CLI chaincode query command requires a target channel via the -C (or --channelID) flag. chaincodeQuery validates the global channelID before building the proposal; a query is always channel-scoped, so an empty channel makes the request meaningless and it aborts early.

Source

Thrown at internal/peer/chaincode/query.go:50

		"name",
		"channelID",
		"peerAddresses",
		"tlsRootCertFiles",
		"connectionProfile",
	}
	attachFlags(chaincodeQueryCmd, flagList)

	chaincodeQueryCmd.Flags().BoolVarP(&chaincodeQueryRaw, "raw", "r", false,
		"If true, output the query value as raw bytes, otherwise format as a printable string")
	chaincodeQueryCmd.Flags().BoolVarP(&chaincodeQueryHex, "hex", "x", false,
		"If true, output the query value byte array in hexadecimal. Incompatible with --raw")

	return chaincodeQueryCmd
}

func chaincodeQuery(cmd *cobra.Command, cf *ChaincodeCmdFactory, cryptoProvider bccsp.BCCSP) error {
	if channelID == "" {
		return errors.New("The required parameter 'channelID' is empty. Rerun the command with -C flag")
	}
	// Parsing of the command line is done so silence cmd usage
	cmd.SilenceUsage = true

	var err error
	if cf == nil {
		cf, err = InitCmdFactory(cmd.Name(), true, false, cryptoProvider)
		if err != nil {
			return err
		}
	}

	return chaincodeInvokeOrQuery(cmd, false, cf)
}

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Re-run with the channel: peer chaincode query -C <channel-name> -n <cc> -c '<args>'
2. Export/define the channel variable in your environment or script before invoking.
3. Validate the channel argument in wrapper scripts before calling the peer CLI.

Example fix

// before
peer chaincode query -n mycc -c '{"Args":["get","a"]}'
// after
peer chaincode query -C mychannel -n mycc -c '{"Args":["get","a"]}'

if [ -z "$CHANNEL_NAME" ]; then echo "error: -C channelID required" >&2; exit 1; fi
peer chaincode query -C "$CHANNEL_NAME" -n mycc -c '{"Args":["get","a"]}'

function hasChannelID(args) { return typeof args.C === 'string' && args.C.length > 0; }

When it happens

Trigger: Running `peer chaincode query` without -C/--channelID, or with -C set to an empty string.

Common situations: Forgetting the flag in shell scripts or CI jobs; confusing the -n (chaincode name) flag with -C (channel); copying examples that omitted the flag; channel name resolved from an unset variable.

Understand the failure class

Background: "--flag is required" and "must specify" CLI errors: how missing-required-flag validation works and how to fix it — this error's family across 20 libraries.

Related errors

• The required parameter 'channelID' is empty. Rerun the comma
• cannot specify both "--signature-policy" and "--channel-conf
• must supply value for %s name parameter
• must supply channel ID
• channel name must be specified

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/290dd0310e45efdb. Report an issue: GitHub.