code: func rpcNoTxInfoError(txHash *chainhash.Hash) *btcjson.RPCError {
  	return btcjson.NewRPCError(btcjson.ErrRPCNoTxInfo,
  		fmt.Sprintf("No information available about transaction %v",
  			txHash))
  }
docs: // rpcNoTxInfoError is a convenience function for returning a nicely formatted
  // RPC error which indicates there is no information available for the provided
  // transaction hash.