Ошибка raise KeyError(key) from err KeyError: 0

def kal4(freq_info, level_info, sensor2_info, startcol: int=1, startrow: int=1, sheet_name : str="Калибровка 4"):
    kal4 = pd.DataFrame({'Время': [today.strftime("%d/%m/%Y-%H:%M.%S")],
                        'Частота': [freq_info[0:10]],
                        'P генератора': [level_info[0:6]],
                        'Датчик 2': [sensor2_info[0:6]]})
    print(kal4)
    
    xlsx_path = os.path.dirname(__file__) + r"\results.xlsx"
    wb = ox.load_workbook(xlsx_path) # открываем файл
 
    for ir in range(0, len(kal4)): # перебираем строки
        for ic in range(0, len(kal4[ir])): # перебираю данные из датафрейма
            wb['Калибровка 4'].cell(startrow + ir, startcol + ic).value = kal4.iloc[ir][ic] # записываю данные в строки таблицы
    
    wb.save(xlsx_path)

PS H:\739> & C:/Users/user/AppData/Local/Programs/Python/Python37-32/python.exe h:/739/739.py
                 Время     Частота P генератора Датчик 2
0  02/03/2022-10:17.53  2000000000        -30\n   -73.81
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\indexes\base.py", line 3361, in get_loc
    return self._engine.get_loc(casted_key)
  File "pandas\_libs\index.pyx", line 76, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\hashtable_class_helper.pxi", line 5198, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas\_libs\hashtable_class_helper.pxi", line 5206, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 0
 
The above exception was the direct cause of the following exception:
 
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "h:/739/739.py", line 462, in <lambda>
    add_to_excel_kal4 = tk.Button(group_3, text='Калибровка 4', command=lambda:kal4(freq_info, level_info, sensor2_info), width=20)
  File "h:/739/739.py", line 226, in kal4
    for ic in range(0, len(kal4[ir])): # перебираю данные из датафрейма
  File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\frame.py", line 3458, in __getitem__
    indexer = self.columns.get_loc(key)
  File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\indexes\base.py", line 3363, in get_loc
    raise KeyError(key) from err
KeyError: 0