A question about 'Event loop is closed'

[fc5igm]

I will appreciate it if anyone could give me some help!
My code:

import asyncio
import aiohttp
from lxml import etree
import requests
headers = {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36'
}
async def download(url):
    name = url.rsplit('/',1)[1]
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as res:
            with open(f'彼岸桌面壁纸下载/{name}','wb') as f: # '彼岸壁纸下载' is a directory I builded before.
                f.write(await res.content.read())
async def main():
    tasks=[]
    for url in urls:
        tasks.append(download(url))
    await asyncio.wait(tasks)
if __name__ == '__main__':
    url0 = 'https://www.enterdesk.com/zhuomianbizhi/'
    text = requests.get(url0).text
    tree = etree.HTML(text)
    urls = tree.xpath('/html/body/div[13]/div[1]/div/dl/dd/a/img/@src')
    asyncio.run(main())

Error:

Error:
D:\MyPcharmProject\venv\Scripts\python.exe D:/MyPcharmProject/爬虫/Umei.py
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000023AD6F1C670>
Traceback (most recent call last):
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 116, in __del__
    self.close()
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 711, in call_soon
    self._check_closed()
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 504, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
Process finished with exit code 0

It seem that pictures have been captured. However, I can't make this error disappear even though I use try-except!