<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _from_dict(cls, _dict):
 """Initialize a UtteranceAnalysis object from a json dictionary."""

        args = {}
        if 'utterance_id' in _dict:
            args['utterance_id'] = _dict.get('utterance_id')
        else:
            raise ValueError(
                'Required property \'utterance_id\' not present in UtteranceAnalysis JSON'
            )
        if 'utterance_text' in _dict:
            args['utterance_text'] = _dict.get('utterance_text')
        else:
            raise ValueError(
                'Required property \'utterance_text\' not present in UtteranceAnalysis JSON'
            )
        if 'tones' in _dict:
            args['tones'] = [
                ToneChatScore._from_dict(x) for x in (_dict.get('tones'))
            ]
        else:
            raise ValueError(
                'Required property \'tones\' not present in UtteranceAnalysis JSON'
            )
        if 'error' in _dict:
            args['error'] = _dict.get('error')
        return cls(**args)