{"record":{"id":"ef33b127da90e3af","repo":"hyperledger/fabric","slug":"the-required-parameter-channelid-is-empty-rerun","errorCode":null,"errorMessage":"The required parameter 'channelID' is empty. Rerun the command with -C flag","messagePattern":"The required parameter 'channelID' is empty\\. Rerun the command with -C flag","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/peer/chaincode/invoke.go","lineNumber":48,"sourceCode":"\tflagList := []string{\n\t\t\"name\",\n\t\t\"ctor\",\n\t\t\"isInit\",\n\t\t\"channelID\",\n\t\t\"peerAddresses\",\n\t\t\"tlsRootCertFiles\",\n\t\t\"connectionProfile\",\n\t\t\"waitForEvent\",\n\t\t\"waitForEventTimeout\",\n\t}\n\tattachFlags(chaincodeInvokeCmd, flagList)\n\n\treturn chaincodeInvokeCmd\n}\n\nfunc chaincodeInvoke(cmd *cobra.Command, cf *ChaincodeCmdFactory, cryptoProvider bccsp.BCCSP) error {\n\tif channelID == \"\" {\n\t\treturn errors.New(\"The required parameter 'channelID' is empty. Rerun the command with -C flag\")\n\t}\n\t// Parsing of the command line is done so silence cmd usage\n\tcmd.SilenceUsage = true\n\n\tvar err error\n\tif cf == nil {\n\t\tcf, err = InitCmdFactory(cmd.Name(), true, true, cryptoProvider)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\tdefer cf.BroadcastClient.Close()\n\n\treturn chaincodeInvokeOrQuery(cmd, true, cf)\n}\n","sourceCodeStart":30,"sourceCodeEnd":64,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/internal/peer/chaincode/invoke.go#L30-L64","documentation":"The peer CLI chaincode invoke command requires a target channel, supplied via the -C (or --channelID) flag. chaincodeInvoke checks the global channelID variable before doing any work and fails fast if it is empty, because the proposal must be sent to a specific channel's endorsers.","triggerScenarios":"Running `peer chaincode invoke` (or the chaincodeInvoke command via a wrapper) without passing -C/--channelID, or passing an empty string for it.","commonSituations":"Scripting the invoke and forgetting the flag; copying a query command line that used -c for a chaincode name and omitting -C; old scripts written before -C became effectively mandatory; environment-variable-driven automation where the channel value is unset.","solutions":["Re-run the command with the channel flag: peer chaincode invoke -C <channel-name> ...","Set the channel explicitly in the script/automation, e.g. CHANNEL_NAME=mychannel and add -C $CHANNEL_NAME.","If wrapping the CLI, validate the channel argument before exec-ing the peer binary."],"exampleFix":"// before\npeer chaincode invoke -n mycc -c '{\"Args\":[\"put\",\"a\",\"1\"]}' -C \"\"\n// after\npeer chaincode invoke -C mychannel -n mycc -c '{\"Args\":[\"put\",\"a\",\"1\"]}'","handlingStrategy":"validation","validationCode":"if [ -z \"$CHANNEL_NAME\" ]; then echo \"error: -C channelID required\" >&2; exit 1; fi\npeer chaincode invoke -C \"$CHANNEL_NAME\" ...","typeGuard":"function hasChannelID(args) { return typeof args.C === 'string' && args.C.length > 0; }","tryCatchPattern":null,"preventionTips":["Always include -C in chaincode invoke invocations and templates.","Use a shared script/function that injects CHANNEL_NAME.","Lint shell scripts for peer commands missing -C."],"tags":["cli","fabric","chaincode","missing-flag"],"backgroundTag":"missing-required-flag","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}