More forum-topic-navigation errors

Just today I upgraded to a version that supposedly fixed the forum-topic-navigation error, but the first time testing it I got this:

When going into a topic post I get the following error:

* warning: theme(themes/deco/forum-topic-navigation) [function.theme]: failed to open stream: No such file or directory in /Library/WebServer/Documents/SDU/includes/theme.inc on line 593.
* warning: theme() [function.include]: Failed opening 'themes/deco/forum-topic-navigation' for inclusion (include_path='.:') in /Library/WebServer/Documents/SDU/includes/theme.inc on line 593.
* warning: call_user_func_array() [function.call-user-func-array]: First argumented is expected to be a valid callback, 'deco_forum_topic_navigation' was given in /Library/WebServer/Documents/SDU/includes/theme.inc on line 597.