KeyError: "There is no item named 'xl/sharedStrings.xml' in the archive"

при попытке открытия xlsx файла появляется такая ошибка

Traceback (most recent call last): File "C:/Users/4r4r5/PycharmProjects/untitled2/Main.py", line 10, in matcher.rename_drugs() File "C:\Users\4r4r5\PycharmProjects\untitled2\Matcher.py", line 196, in rename_drugs self.__directory + file) # for files from directory creates csv copy File "C:\Users\4r4r5\PycharmProjects\untitled2\Matcher.py", line 94, in __csv_from_excel wb = openpyxl.load_workbook(datapath) File "C:\Users\4r4r5\PycharmProjects\untitled2\venv\lib\site-packages\openpyxl\reader\excel.py", line 314, in load_workbook reader.read() File "C:\Users\4r4r5\PycharmProjects\untitled2\venv\lib\site-packages\openpyxl\reader\excel.py", line 274, in read self.read_strings() File "C:\Users\4r4r5\PycharmProjects\untitled2\venv\lib\site-packages\openpyxl\reader\excel.py", line 143, in read_strings with self.archive.open(strings_path,) as src: File "C:\Users\4r4r5\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1470, in open zinfo = self.getinfo(name) File "C:\Users\4r4r5\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1398, in getinfo 'There is no item named %r in the archive' % name) KeyError: "There is no item named 'xl/sharedStrings.xml' in the archive"

мой код

def __csv_from_excel(filename, datapath):  # read from datapath; write to filename  
    try:  
        if (datapath[-4:]) == "xlsx":
            wb = openpyxl.load_workbook(datapath)
            filenames = []
            sheets = wb.sheetnames
        for sheet in sheets:
            sh = wb[str(sheet)]
            with open(filename[:-4] + sheet + ".csv", 'tw', newline='') as f:
                filenames.append(filename[:-4] + sheet + ".csv")
                wr = csv.writer(f, quoting=csv.QUOTE_ALL, delimiter=";")
                for row in sh.rows:
                    temp = []
                    for cell in row:
                        temp.append(cell.value)
                    wr.writerow(temp)
                f.close()
        return filenames
    elif (datapath[-4:]) == ".xls":
        wb = xlrd.open_workbook(datapath, encoding_override="cp1251")
        sheetlist = wb.sheet_names()
        filenames = []
        for sheet in sheetlist:
            sh = wb.sheet_by_name(sheet)
            with open(filename[:-4] + sheet + ".csv", 'tw', newline='') as f:
                filenames.append(filename[:-4] + sheet + ".csv")
                wr = csv.writer(f, quoting=csv.QUOTE_ALL, delimiter=";")
                for rownum in range(sh.nrows):
                    wr.writerow(sh.row_values(rownum))
                f.close()
        return filenames
except UnicodeDecodeError:
    print(datapath)  

Подскажите пожалуйста в чем может быть причина