my provider change the php version to 5.3.1, i updated joomla to version 1.5.15 and install the latest version of K2 yesterday. and now i have a big problem with K2. i use this for an onlinevideoservice and the complete K2 component is down with following codes:

Warning: Parameter 1 to K2ModelItem::prepareItem() expected to be a reference, value given in /var/kunden/webs/web4012/libraries/joomla/cache/handler/callback.php on line 99

after login i became two other codes:

Warning: Parameter 2 to plgContentAlphacontent::onBeforeDisplayContent() expected to be a reference, value given in /var/kunden/webs/web4012/libraries/joomla/event/event.php on line 67

Warning: Parameter 2 to plgFavesList() expected to be a reference, value given in /var/kunden/webs/web4012/libraries/joomla/event/dispatcher.php on line 136

look at my site and you will see the problem - LINK

sorry for my english, please help me and my community - thx.