{"record":{"id":"d7e0d9ef70a15455","repo":"hyperledger/fabric","slug":"the-required-parameter-blocknumber-is-empty-or-s","errorCode":null,"errorMessage":"the required parameter 'blockNumber' is empty or set to 0. Rerun the command with -b flag","messagePattern":"the required parameter 'blockNumber' is empty or set to 0\\. Rerun the command with -b flag","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/peer/snapshot/cancelrequest.go","lineNumber":87,"sourceCode":"\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":69,"sourceCodeEnd":91,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/internal/peer/snapshot/cancelrequest.go#L69-L91","documentation":"The peer snapshot cancelrequest command requires the block number at which the snapshot was requested, passed via -b/--blockNumber. validateCancelRequest rejects the command when blockNumber is unset or explicitly 0, since 0 is not a valid snapshot request block number to cancel.","triggerScenarios":"Running 'peer snapshot cancelrequest' without -b, or with -b 0; passing a non-numeric value that parses to the zero value.","commonSituations":"Scripts where the block-number variable defaulted to 0 or failed to expand; mistaking the flag for optional; using a block number from a different channel that was never requested.","solutions":["Rerun with a nonzero block number: peer snapshot cancelrequest -c <channelID> -b <blockNumber>.","Use 'peer snapshot listpending' to find valid pending block numbers to cancel.","Validate the block number variable is > 0 in scripts before invoking."],"exampleFix":"// before\npeer snapshot cancelrequest -c mychannel -b 0\n// after\npeer snapshot cancelrequest -c mychannel -b 1500","handlingStrategy":"validation","validationCode":"if [ -z \"$BLOCK\" ] || [ \"$BLOCK\" -le 0 ] 2>/dev/null; then\n  echo \"blockNumber must be a positive integer\"; exit 1\nfi\npeer snapshot cancelrequest -c \"$CHANNEL\" -b \"$BLOCK\"","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Run 'peer snapshot listpending' first to obtain valid block numbers","Reject zero/empty block numbers in scripts","Remember -b is mandatory for cancelrequest"],"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"}