I just updated to the latest version & now get this error:

Fatal error: Class 'K2Model' not found in /MySite/components/com_k2/models/itemlist.php on line 18

Any page w/ a K2 item only shows this error. Is there a fix or can someone tell me when the update does not have this problem? I had to re install a prior version & it whipped out my K2 items.