Comment 4 for bug 1452067

"If your script works on one computer but not another, it’s probably because the two computers have different parser libraries available. For example, you may have developed the script on a computer that has lxml installed, and then tried to run it on a computer that only has html5lib installed."

http://www.crummy.com/software/BeautifulSoup/bs4/doc/#other-parser-problems

If this does not describe your problem, please reopen this bug and mention which parser you are using to parse the page.