Hello,
when I open the Categories panel I see this line above the list of categories:

Notice: Undefined property: stdClass::$theme in /PATH_FROM_HOST/htdocs/nikoNEW/administrator/components/com_k2/views/categories/view.html.php on line 65

What is the problem? I haven't altered any of the items or php files.

Thanks,
S@

Turn off error reporting in Joomla Gloabal Settings Server Tab

Thanks :D