runtime error

Traceback (most recent call last): File "/home/user/app/app.py", line 212, in <module> cities_datafram = get_name_of_cities() File "/home/user/app/app.py", line 163, in get_name_of_cities total_df = pd.DataFrame({'ArrivalAirportEnglish': pd.concat([df1['ArrivalAirportEnglish'], df['ArrivalAirportEnglish']]).drop_duplicates().reset_index(drop=True),'ArrivalAirportIata': pd.concat([df1['ArrivalAirportIata'], df['ArrivalAirportIata']]).drop_duplicates().reset_index(drop=True)}) File "/usr/local/lib/python3.10/site-packages/pandas/core/frame.py", line 3893, in __getitem__ indexer = self.columns.get_loc(key) File "/usr/local/lib/python3.10/site-packages/pandas/core/indexes/range.py", line 418, in get_loc raise KeyError(key) KeyError: 'ArrivalAirportEnglish'

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