<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_json(self):
 """Load JSON from the request body and store them in self.request.arguments, like Tornado does by default for POSTed form parameters. If JSON cannot be decoded :raises ValueError: JSON Could not be decoded """

        try:
            self.request.arguments = json.loads(self.request.body)
        except ValueError:
            msg = "Could not decode JSON: %s" % self.request.body
            self.logger.debug(msg)
            self.raise_error(400, msg)