hyperledger/fabric · error

could not read block %s

Error message

could not read block %s

What it means

Returned by doInspectBlock when os.ReadFile fails on the block file passed to the -inspectBlock flag — typically a nonexistent path, a directory, or an unreadable file. Unlike the other errors in this function, this one indicates the input file could not even be read, before any protobuf parsing is attempted.

Source

Thrown at cmd/configtxgen/main.go:83

		configtx, err = encoder.MakeChannelCreationTransactionWithSystemChannelContext(channelID, nil, conf, baseProfile)
	}
	if err != nil {
		return err
	}

	logger.Info("Writing new channel tx")
	err = writeFile(outputChannelCreateTx, protoutil.MarshalOrPanic(configtx), 0o640)
	if err != nil {
		return fmt.Errorf("error writing channel create tx: %s", err)
	}
	return nil
}

func doInspectBlock(inspectBlock string) error {
	logger.Info("Inspecting block")
	data, err := os.ReadFile(inspectBlock)
	if err != nil {
		return fmt.Errorf("could not read block %s", inspectBlock)
	}

	logger.Info("Parsing genesis block")
	block, err := protoutil.UnmarshalBlock(data)
	if err != nil {
		return fmt.Errorf("error unmarshalling to block: %s", err)
	}
	err = protolator.DeepMarshalJSON(os.Stdout, block)
	if err != nil {
		return fmt.Errorf("malformed block contents: %s", err)
	}
	return nil
}

func doInspectChannelCreateTx(inspectChannelCreateTx string) error {
	logger.Info("Inspecting transaction")
	data, err := os.ReadFile(inspectChannelCreateTx)
	if err != nil {

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Confirm the block file exists at the given path and is readable
2. Regenerate or re-copy the block file if it was moved or deleted

When it happens

Trigger: Thrown at cmd/configtxgen/main.go:83 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/ead44dfe51b97bed. Report an issue: GitHub.