My b2evolution Version: Not Entered

I get this message on the page that opens, when I want to see the permalink for a post.

Can anybody help me solve this problem?

Notice: Only variable references should be returned by reference in /hsphere/local/home/simon/blog.bendfeldt.dk/inc/MODEL/dataobjects/_dataobjectlist.class.php on line 111

I have already solved similar problem with the help from this forum.

Thanks in advance.

Best Regards Simon