# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2011-07-02 17:12:44 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/87207088576667648) RT @Cocoanetics: Warning if you work with 4.2 but build for submission with 4.0: I found that a CoreData model was incompatible. Recreat ...