Using Joomla! 2.5.8 with K2 version 2.6.6. Both freshly installed. Set up an item (article) linked it to a category. Set the category to a menu. WHen I click the menu item I get a Server error Error 500.

I've tried everything anyone that has had a silimar problem and the results are the same as above.

Can someone help me.

Hello migzam,

First of all Joomla! 2.5.8 is an old and outdated version, you should upgrade asap.
I think there is something wrong with your template,you must set error reporting to development and locate error.