책예제 보고 따라하는데 오류가 나는데 왜그런지 좀 알려주세요.ㅠ

​

from urllib.request import urlopen
from bs4 import BeautifulSoup

html = urlopen("http://en.wikipedia.org/wiki/kevin_bacon")
bs0bj = BeautifulSoup(html, "html.parser")
for link in bs0bj.findall("a"):
    if 'href' in link.attrs:
        print(link.attrs['href'])

책 왼쪽 페이지에 있는 소스를 쳐서 run 시켜보앗는데 , 저런 오류가 나옵니다. 소스가 완성형이 아니어서 그런거 같긴 한데 , 그렇다 이렇다 설명이 책에 없어서 , 따라해도 오류가 생기면 , 이해가 잘 안되서 넘 어렵네요..ㅠㅠ 왜 저런 오류가 뜨는지 가르쳐주세용 ㅠ

Traceback (most recent call last):
  File "C:\Users\Administrator\eclipse-workspace\HelloWorld\crow4.py", line 4, in <module>
    html = urlopen("http://en.wikipedia.org/wiki/kevin_bacon")
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 532, in open
    response = meth(req, response)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 564, in error
    result = self._call_chain(*args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 504, in _call_chain
    result = func(*args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 756, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 532, in open
    response = meth(req, response)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 564, in error
    result = self._call_chain(*args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 504, in _call_chain
    result = func(*args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 756, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 532, in open
    response = meth(req, response)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 570, in error
    return self._call_chain(*args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 504, in _call_chain
    result = func(*args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\lib\urllib\request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found

​

이 오류의 뜻만이라도 좀 가르쳐주시면 ㄳㄳ ㅠ

책 한페이지 넘어가기가 정말 힘드네요 휴;;