Charm++ parallel programming system

[<rug262 AT psu.edu>]

I am using charm++ v 6.7.1 and trying to build the documentation.  I've
installed latex-html and python-bs4 (they were lacking in my system), but I
get another error now that I don't know how to resolve:


*********** WARNINGS ***********
No implementation found for style `../pplmanual'
No implementation found for style `graphicx'
No implementation found for style `calc'
No implementation found for style `fancyvrb'
No implementation found for style `hyphenat'
No implementation found for style `listings'
No implementation found for style `hyperref'

redefining command \thepart

Substitution of arg to newlabelxx delayed.

There is no author for this document.

Unknown commands: credits version nohyphens hypersetup
Done.
../navmenuGenerator.py manual/index.html > tmp-navmenu.html
Traceback (most recent call last):
  File "../navmenuGenerator.py", line 16, in <module>
    toc = soup.find("ul","ChildLinks").extract()
AttributeError: 'NoneType' object has no attribute 'extract'


Any help is appreciated.

Rob