Core Data errors in iPhone app. "_OBJC_CLASS_$_NSFetchedResultsController"

"_OBJC_CLASS_$_NSFetchedResultsController", referenced from: objc-class-ref-to-NSFetchedResultsController in RootViewController.o

I'm getting 7 of the errors above in my iphone app. I had an app that used core data but i wanted to use an rss xml parser with it, so i created a new empty app and put both of the projects开发者_如何学Go into it, now i have 7 errors all the same as above!? Any ideas?

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Make sure you added the CoreData Framework to your project.