<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _send_err(self, msg, errName, errMsg):
 """ Helper method for sending error messages """

        r = message.ErrorMessage(
            errName,
            msg.serial,
            body=[errMsg],
            signature='s',
            destination=msg.sender,
        )

        self.conn.sendMessage(r)