objective c - Incompatible Object Model Version -

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can explain what's going on here? have file saved new version of application - yet if close application , double click document file, gives me error:

the document “main” not opened. managed object model version used open persistent store incompatible 1 used create persistent store.

now, have checked google , appears common, however, tried advise of deleting files in application support folder (it's folder doesn't exist reason) , cleaned targets xcode (build > clean targets) no luck. weirdest part is, when accept error , take @ application loaded, it's old version. can find mystery version of application , how fix it??!

just who's having issues - having issues installing application correctly (when testing app store submission), , when looking @ installer logs, showed app in weird locations on computer. delete , reinstall (or don't, if debugging xcode) , problem solved.


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