다음과 같은 코드를 실행하는데 

import urllib.request
from bs4 import BeautifulSoup
import re
import os

from bs4 import BeautifulSoup
with open("d:\ecologicalpyramid.html","r") as ecological_pyramid:
     soup = BeautifulSoup(ecological_pyramid,"lxml")
producer_entries = soup.find("ul")
print(producer_entries.li.div.string)

계속 사진과 같은 오류가 납니다 ㅠㅠㅠㅠ

왜 이럴까요 ㅠㅠㅠ