{"record":{"id":"aec938ed4d2be00f","repo":"hyperledger/fabric","slug":"the-required-parameter-channelid-is-empty-rerun-aec938","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/snapshot/cancelrequest.go","lineNumber":84,"sourceCode":"\t\tBlockNumber:     blockNumber,\n\t}\n\tsignedRequest, err := signSnapshotRequest(cl.signer, request)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\t_, err = cl.snapshotClient.Cancel(context.Background(), signedRequest)\n\tif err != nil {\n\t\treturn errors.WithMessage(err, \"failed to cancel the request\")\n\t}\n\n\tfmt.Fprint(cl.writer, \"Snapshot request cancelled successfully\\n\")\n\treturn nil\n}\n\nfunc validateCancelRequest() error {\n\tif channelID == \"\" {\n\t\treturn errors.New(\"the required parameter 'channelID' is empty. Rerun the command with -c flag\")\n\t}\n\tif blockNumber == 0 {\n\t\treturn errors.New(\"the required parameter 'blockNumber' is empty or set to 0. Rerun the command with -b flag\")\n\t}\n\treturn nil\n}\n","sourceCodeStart":66,"sourceCodeEnd":91,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/internal/peer/snapshot/cancelrequest.go#L66-L91","documentation":"The peer snapshot cancelrequest command validates that the mandatory -c/--channelID flag was supplied before submitting a CancelSnapshotRequest to the peer. When the package-level channelID variable is empty, this error aborts the command with an instruction to rerun with -c.","triggerScenarios":"Running 'peer snapshot cancelrequest' without the -c/--channelID flag, or with -c \"\" so the flag binding leaves channelID empty.","commonSituations":"Scripted snapshot cancellation built from templates where the channel variable failed to expand; forgetting the flag because it is required only for snapshot subcommands; copy-pasting an example command that omitted -c.","solutions":["Rerun with the channel flag: peer snapshot cancelrequest -c <channelID> -b <blockNumber>.","In scripts, guard with a check like [ -n \"$CHANNEL\" ] before invoking the command.","Verify the flag binding: use the full --channelID form if parsing issues are suspected."],"exampleFix":"// before\npeer snapshot cancelrequest -b 1500\n// after\npeer snapshot cancelrequest -c mychannel -b 1500","handlingStrategy":"validation","validationCode":"if [ -z \"$CHANNEL\" ]; then echo \"usage: peer snapshot cancelrequest -c <channelID> -b <blockNumber>\"; exit 1; fi\npeer snapshot cancelrequest -c \"$CHANNEL\" -b \"$BLOCK\"","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Always pass -c and -b together for snapshot cancelrequest","Validate env vars in wrapper scripts","Check --help output before scripting snapshot subcommands"],"tags":["cli","snapshot","missing-flag","fabric"],"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"}