Looks like you are using _profile.php file from an older version? k2e is available for 1.8 and 1.8.1 so you might want to grab it and see about pulling the _profile.php file from it. Also I did it and the more I look at it the more I think it looks like crap. Feedback on the new version will be appreciated.

http://forums.b2evolution.net/viewtopic.php?t=8980 tells you where the temporary demo site is.