function createUnparsableFileError(message, filename) {
    var err = new Error(message);
    err.code = constants$4.UNPARSABLE_FILE;
    return err;
  }
Creates an error object to be thrown when file is unparsable
@public
@static
@param {string} message - Error message to be displayed.
@param {string} filename - File name
@returns {Error} Error with code {@link constants.UNPARSABLE_FILE}