Ошибка assert msg.__class__ is suds.byte_str_class AssertionError

Помогите пожалуйста решить проблему,вот код:

from suds.client import Client
from suds.sudsobject import asdict
from suds.sax.text import Text
from openpyxl import load_workbook
import datetime
import json

class Excel_get():
    def __init__(self):
        self.wb = load_workbook('barcode.xlsx')
        self.ws = self.wb.get_sheet_by_name("Sheet")

    def get_barcode(self):
        ws_kol = self.ws.max_row + 1
        list_articl = []
        for r in range(1, ws_kol):
            c = self.ws.cell(row=r, column=1).value
            list_articl.append(c)

        return list_articl


class PoshtaPU():
    def __init__(self, code):
        self.url = 'https://tracking.russianpost.ru/rtm34?wsdl'
        self.client = Client(self.url, headers={'Content-Type': 'application/soap+xml; charset=utf-8'})
        self.barcode = code
        self.my_login = 'login'
        self.my_password = 'password'

    def recursive_asdict(self,d):

        out = {}
        for k, v in asdict(d).items():
            k = k.lower()
            if hasattr(v, '__keylist__'):
                out[k] = self.recursive_asdict(v)
            elif isinstance(v, list):
                out[k] = []
                for item in v:
                    if hasattr(item, '__keylist__'):
                        out[k].append(self.recursive_asdict(item))
                    else:
                        out[k].append(
                            item.title() if isinstance(item, Text) else item)
            else:
                out[k] = v.title() if isinstance(v, Text) else v
        return out


    def get_result(self):
        message = \
        """<?xml version="1.0" encoding="UTF-8"?>
        <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:oper="http://russianpost.org/operationhistory" xmlns:data="http://russianpost.org/operationhistory/data" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
        <soap:Header/>
        <soap:Body>
            <oper:getOperationHistory>
                <data:OperationHistoryRequest>
                    <data:Barcode>""" + self.barcode + """</data:Barcode>  
                    <data:MessageType>0</data:MessageType>
                    <data:Language>RUS</data:Language>
                </data:OperationHistoryRequest>
                <data:AuthorizationHeader soapenv:mustUnderstand="1">
                    <data:login>""" + self.my_login + """</data:login>
                    <data:password>""" + self.my_password + """</data:password>
                </data:AuthorizationHeader>
            </oper:getOperationHistory>
        </soap:Body>
        </soap:Envelope>"""
        result = self.client.service.getOperationHistory(__inject={'msg': message})
        result_json = self.recursive_asdict(result)
        print(result_json)
        return result_json

def main():
    # e = Excel_get()
    # list_articl = e.get_barcode()
    # for article in list_articl[:5]:
    p = PoshtaPU('80086148106435')
    p.get_result()



if __name__ == '__main__':
    main()

Ошибка:File "C:/Users/Антон/PycharmProjects/doestmatter/venv/test_poshta.py", line 89, in main() File "C:/Users/Антон/PycharmProjects/doestmatter/venv/test_poshta.py", line 84, in main p.get_result() File "C:/Users/Антон/PycharmProjects/doestmatter/venv/test_poshta.py", line 74, in get_result result = self.client.service.getOperationHistory(inject={'msg': message}) File "C:\Users\Антон\PycharmProjects\doestmatter\venv\lib\site-packages\suds\client.py", line 521, in __call return client.invoke(args, kwargs) File "C:\Users\Антон\PycharmProjects\doestmatter\venv\lib\site-packages\suds\client.py", line 760, in invoke assert msg.class is suds.byte_str_class AssertionError