My b2evolution Version: 1.10.x

After I installed b2evolution I've had this error:

Notice: Only variable references should be returned by reference in /home/gotekine/public_html/blog/blogs/inc/MODEL/dataobjects/_dataobjectcache.class.php on line 121

Warning: Cannot modify header information - headers already sent by (output started at /home/gotekine/public_html/blog/blogs/inc/MODEL/dataobjects/_dataobjectcache.class.php:121) in /home/gotekine/public_html/blog/blogs/default.php on line 28

Some pages show up even if I have this error thus I can browse, but whenever I try to edit something, I get this error and nothing else. Tried looking at past topics, nothing.
Also, it worked perfectly fine in my local webserver, so I tried to mess up a bit with chmods, but it didn't help.