While structuring Conf (1 sub-exception):
 While structuring typing.List[readfish._config.Region] (2 sub-exceptions):
  While structuring Region (6 sub-exceptions):
   - KeyError('single_on')
   - KeyError('single_off')
   - KeyError('multi_on')
   - KeyError('multi_off')
   - KeyError('no_map')
   - KeyError('no_seq')
  While structuring Region (1 sub-exception):
   - KeyError('name')
