Не создаеться файл, в чем может быть проблема?

import requests
from bs4 import BeautifulSoup
import csv
 
def get_html(url):
    r = requests.get(url)
    return r.text
 
def get_total_pages(html):
    total_pages = 1
    
    
def write_csv(data):
    with open('youla.csv', 'a', encoding='utf8') as f:
        writer = csv.writer(f)
 
        writer.writerow( (data['title'],
                          data['price'],
                          data['url']) )
 
def get_page_data(html):
    soup = BeautifulSoup(html, 'lxml')
    ads = soup.find('ul',class_='product_list _board_items product_list--type_inline ').find_all('div', class_='tooltip_container')
 
    for ad in ads:
        try:
            title = ad.find('div', class_='product_item__title').find('div', class_='product_item__title').text.strip()
        except:
            title =''
 
        try:
            url = ad.find('li', class_='class="product_item"').find('a').get('href')
        except:
            url = ''
 
        try:
            price = ad.find('div', class_='product_item__description ').text.strip()
        except:
            price = ''
 
        
        data = {'title': title,
                'price': price,
                'url': url}
 
        write_csv(data)
 
 
 
def main():
    url = 'https://youla.ru/naberezhnye_chelny?attributes[term_of_placement][from]=-1%20day&attributes[term_of_placement][to]=now&q=игровые%20приставки'
    base_url = 'https://youla.ru/naberezhnye_chelny?attributes[term_of_placement][from]=-1%20day&attributes[term_of_placement][to]=now&q='
    page_part = 'p='
    query_part = 'игровые%20приставки'
    
 
if __name__== '__main__':
    main()

url = 'https://youla.ru/naberezhnye_chelny?attributes[term_of_placement][from]=-1%20day&attributes[term_of_placement][to]=now&q=игровые%20приставки'
get_page_data(get_html(url))

Traceback (most recent call last):
  File "youla.py", line 58, in <module>
    main()
  File "youla.py", line 55, in main
    get_page_data(get_html(url))
  File "youla.py", line 23, in get_page_data
    ads = soup.find('ul',class_='product_list _board_items product_list--type_inline ').find_all('div', class_='tooltip_container')
AttributeError: 'NoneType' object has no attribute 'find_all'
 
***Repl Closed***