hyperledger/fabric · error

Must supply channel ID

Error message

Must supply channel ID

What it means

Cobra RunE guard for 'peer channel unjoin': the --channelID flag (checked via common.UnundefinedChannelID) was empty, so the command cannot know which channel's local data to remove. The peer must also be offline when it runs.

Source

Thrown at internal/peer/node/unjoin.go:29

	coreconfig "github.com/hyperledger/fabric/core/config"
	"github.com/hyperledger/fabric/core/ledger/kvledger"
	"github.com/hyperledger/fabric/core/transientstore"
	"github.com/hyperledger/fabric/internal/peer/common"
	"github.com/pkg/errors"
	"github.com/spf13/cobra"
)

func unjoinCmd() *cobra.Command {
	var channelID string

	cmd := &cobra.Command{
		Use:   "unjoin",
		Short: "Unjoin the peer from a channel.",
		Long:  "Unjoin the peer from a channel.  When the command is executed, the peer must be offline.",
		RunE: func(cmd *cobra.Command, args []string) error {
			if channelID == common.UndefinedParamValue {
				return errors.New("Must supply channel ID")
			}

			if err := unjoinChannel(channelID); err != nil {
				return err
			}

			return nil
		},
	}
	flags := cmd.Flags()
	flags.StringVarP(&channelID, "channelID", "c", common.UndefinedParamValue, "Channel to unjoin.")

	return cmd
}

// unjoin the peer from a channel.
func unjoinChannel(channelID string) error {
	// transient storage must be scrubbed prior to removing the kvledger for the channel.  Once the

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Supply --channelID with the name of the channel to unjoin
2. Run the command with the peer process stopped

When it happens

Trigger: Thrown at internal/peer/node/unjoin.go:29 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/50aec8f5bfa51015. Report an issue: GitHub.