Wrong error location reporting

[thangngoc89]

type network = Bitcoin | Testnet | Litecoin;

[@bs.module "bitcoinjs-lib"] [@bs.new] external new_tx_builder : network => 'a = "TransactionBuilder";

let createTxBuilder = (~network: option(network)=?, ()) => {
  let network = switch (network) {
  | Some(n) => n
  | None => Testnet
  };
  new_tx_builder(network);
};

This is OCaml's compiler acting up. This is the error message:

File "", Characters -1--1:
Error: The external function `TransactionBuilder' is not available