konqueror can not handle: Type: XHTML Family Document

[Wolfgang Mader <debian-lists@brain-frog.de>]

Hello list,

If I click on this link

http://www.hakubi.us/kaboodle/

I get this message

There appears to be a configuration error. You have associated Konqueror with 
application/xhtml+xml, but it can't handle this file type.

Can someone help me out.
Thank you.