Проблема с кодировкой

from bs4 import BeautifulSoup as bs
import requests
import os, sys
 
 
def xml_feeds():
    
    files_list = ['mobileapp']
 
    for file in files_list:
        new_warnings_filename = file + '_we1'
        warnings_list = []
        with open(r'C:\Users\nik\Desktop\программы\Задание Егора\mobileapp.xml', 'r', encoding='UTF-8') as open_file:
            code = ''.join(open_file.readlines())
 
        soup_code = bs(code, 'lxml')
        offers_found = soup_code.find_all('offer')
        print(len(offers_found))
 
 
 
        for index in range(len(offers_found)):
            print(index, end=' ')
            found = offers_found[index].find_all('categoryid')
            if len(soup_code.find_all('category', {'id': found[0].text})) == 0:
                warnings_list.append(f'No category found [{offers_found[index]["id"]}: {found[0].text}]\n')
            if len(found) > 1:
                if len(soup_code.find_all('category', {'id': found[1].text})) == 0:
                    warnings_list.append(f'No category found [{offers_found[index]["id"]}: {found[1].text}]\n')
            with open(f'{new_warnings_filename}.txt', 'w', encoding='utf-8') as open_file_1:
                open_file_1.writelines(warnings_list)
 
        print()
        print('Tags are done!')
 
        c = 0
        for index in range(len(offers_found)):
            if len(offers_found[index].find_all('picture')) < 1:  
                warnings_list.append(f'No image found in offer id: {offers_found[index]["id"]}\n')
                with open(f'{new_warnings_filename}.txt', 'w', encoding='utf-8') as open_file_1:
                    open_file_1.writelines(warnings_list)
 
        for index in range(len(offers_found)):
            if len(offers_found[index].find_all('price')) < 1: 
                warnings_list.append(f'No price found in offer id: {offers_found[index]["id"]}\n')
                with open(f'{new_warnings_filename}.txt', 'w', encoding='utf-8') as open_file_1:
                    open_file_1.writelines(warnings_list)
 
        with open(f'{new_warnings_filename}.txt', 'w', encoding='utf-8') as open_file_1:
            open_file_1.writelines(warnings_list)
        os.startfile(f'{new_warnings_filename}.txt')
 
 
if __name__ == '__main__':
    xml_feeds()