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{
  "errorMessage": "'ticker'",
  "errorType": "KeyError",
  "requestId": "b698abe8-3ecc-4134-add7-f8ecd398cfe0",
  "stackTrace": [
    "  File \"/var/task/lambda_function.py\", line 387, in lambda_handler\n    res = csv_generator.process(reference_date, reference_date)\n",
    "  File \"/var/task/lambda_function.py\", line 354, in process\n    result_df = get_db_calculator_results(dt, self.dynamo_table, is_preview=self.is_preview)\n",
    "  File \"/var/task/lambda_function.py\", line 101, in get_db_calculator_results\n    df = pd.merge(df, df_d_plus_1, on='ticker', how='left', suffixes=('', '_d+1'))\n",
    "  File \"/opt/python/pandas/core/reshape/merge.py\", line 110, in merge\n    op = _MergeOperation(\n",
    "  File \"/opt/python/pandas/core/reshape/merge.py\", line 703, in __init__\n    ) = self._get_merge_keys()\n",
    "  File \"/opt/python/pandas/core/reshape/merge.py\", line 1162, in _get_merge_keys\n    right_keys.append(right._get_label_or_level_values(rk))\n",
    "  File \"/opt/python/pandas/core/generic.py\", line 1850, in _get_label_or_level_values\n    raise KeyError(key)\n"
  ]
}