this is likely not a bug. try running this command
 yelp /usr/share/gnome/help/files-and-docs/C/files-and-docs.xml

and see if you get the same error message

yelp /usr/share/gnome/help/about-ubuntu/C/about*
should open the about Ubuntu help. if these files are corrupted you will 
probably need to reinstall the package ubuntu-docs

sudo apt-get install ubuntu-docs

-- 
The help system reports that the xml files are invalid - This happens with all 
help topics
https://bugs.launchpad.net/bugs/238112
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