def __str__(self):
        """Return a string containing the error message and field."""
        if hasattr(self, 'ERROR_TYPE'):
            return '`{0}` on field `{1}`'.format(self.message, self.field)
        else:
            return '({0}) `{1}` on field `{2}`'.format(self.error_type,
                                                       self.message,
                                                       self.field)
Return a string containing the error message and field.
rtv/packages/praw/errors.py