{
 "errors": [
  {
   "dataset_code": "NIUnderlyingDetail-U70205S",
   "message": "Exception: KeyError: 'files'"
  },
  {
   "dataset_code": "NIUnderlyingDetail-U70206",
   "message": "Exception: KeyError: 'files'"
  },
  {
   "dataset_code": "NIUnderlyingDetail-U90100",
   "message": "Exception: KeyError: 'files'"
  },
  {
   "dataset_code": "NIUnderlyingDetail-U90200",
   "message": "Exception: KeyError: 'files'"
  },
  {
   "dataset_code": "NIUnderlyingDetail-U90500",
   "message": "Exception: KeyError: 'files'"
  }
 ],
 "nb_expected_datasets": 412
}