Recommend event problem and settings

Hey i'm running this plugin smoothly in elgg 1.7.4 with one exception.

In the user setting it appears this "event_calendar:config_recommendobject(stdClass)#414 (0) { }" right above where i can config the date format!

And then the recommend function doesn't work either. Trying to figuring out where to edit the code. 

Can someone help? Tks