My b2evolution Version: 1.9.x

This error message heads any blogscreen:

Notice: Only variable references should be returned by reference in /hsphere/local/home/sapride/poplogg.no/inc/MODEL/dataobjects/_dataobjectcache.class.php on line 121 Warning: Cannot modify header information - headers already sent by (output started at /hsphere/local/home/sapride/poplogg.no/inc/MODEL/dataobjects/_dataobjectcache.class.php:121) in /hsphere/local/home/sapride/poplogg.no/inc/MODEL/skins/_skin.funcs.php on line 71
Notice: Only variable references should be returned by reference in /hsphere/local/home/sapride/poplogg.no/inc/MODEL/dataobjects/_dataobjectcache.class.php on line 121

Any tips on how to get it to bugger off?

Stian