At the top of the admin page, I get an error messages, saying:
Notice: Only variable references should be returned by reference in /inc/MODEL/dataobjects/_dataobjectcache.class.php on line 121 Warning: Cannot modify header information - headers already sent by (output started
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Found the sollution in this thread: http://forums.b2evolution.net/viewtopic.php?t=10133&highlight=121