Core Data Issue

Question

I am creating a coredata sqlite database file in a mac app (using core data) and am attempting to use the same database and core data model in an ipad app.   I have copied all NSManagedObject files and the .xcdatamodeld directory from the mac app to the ios app.  Even though all files are identical I get "
The model used to open the store is incompatible with the one used to create the store" when trying to read from the store in the app.  My question is what is actually being compared when this error is thrown?  It looks like it throws the error following SELECT Z_VERSION, Z_UUID, Z_PLIST FROM Z_METADATA.   What is a z_uuid?  Any ideas on how to debug this?   my error dump is below.
2014-05-06 12:57:29.118 Genome[9055:60b] CoreData: sql: SELECT Z_VERSION, Z_UUID, Z_PLIST FROM Z_METADATA
2014-05-06 12:57:29.119 Genome[9055:60b] CoreData: annotation: Disconnecting from sqlite database.
2014-05-06 12:57:29.121 Genome[9055:60b] Unresolved error Error Domain=NSCocoaErrorDomain Code=134100 "The operation couldn’t be completed. (Cocoa error 134100.)" UserInfo=0x109527050 {metadata={
    NSPersistenceFrameworkVersion = 481;
    NSStoreModelVersionHashes =     {
        Annotation = <d4eb8bbc 528c6ac9 3cc1decb ca49790e 9933c09b faf47ec9 108fb9b4 b083e144>;
        Band = <14c5dda0 3db4c5c7 27952ce6 5421b597 6d97bed9 b6f225c7 0d956b54 2cfc8282>;
        Gene = <e70a2ed2 fa4c0c3e 1fb8eabc f0f1c26b 9dadb033 0c9198fe 9ba2393e c1a3f9c2>;
        Test = <051b8cd1 849daecf 7a94ac5a 87134d9b 1db8b51c 60bdca34 cb828268 01d6a73a>;
        User = <ebf4a8c8 7209296b 30bdf66c bd7a3dac afa9c8c5 d04f363f 14469686 ba458804>;
        Variant = <58231e33 52687ba7 053846d2 e8d27ed2 58ec690b 2fb09efc 303f299f 2592d6f5>;
    NSStoreModelVersionHashesVersion = 3;
    NSStoreModelVersionIdentifiers =     (
    NSStoreType = SQLite;
    NSStoreUUID = "9B3D312C-95C8-45E3-9F2F-2581E88403A8";
    "_NSAutoVacuumLevel" = 2;
}, reason=The model used to open the store is incompatible with the one used to create the store}, {
    metadata =     {
        NSPersistenceFrameworkVersion = 481;
        NSStoreModelVersionHashes =         {
            Annotation = <d4eb8bbc 528c6ac9 3cc1decb ca49790e 9933c09b faf47ec9 108fb9b4 b083e144>;
            Band = <14c5dda0 3db4c5c7 27952ce6 5421b597 6d97bed9 b6f225c7 0d956b54 2cfc8282>;
            Gene = <e70a2ed2 fa4c0c3e 1fb8eabc f0f1c26b 9dadb033 0c9198fe 9ba2393e c1a3f9c2>;
            Test = <051b8cd1 849daecf 7a94ac5a 87134d9b 1db8b51c 60bdca34 cb828268 01d6a73a>;
            User = <ebf4a8c8 7209296b 30bdf66c bd7a3dac afa9c8c5 d04f363f 14469686 ba458804>;
            Variant = <58231e33 52687ba7 053846d2 e8d27ed2 58ec690b 2fb09efc 303f299f 2592d6f5>;
        NSStoreModelVersionHashesVersion = 3;
        NSStoreModelVersionIdentifiers =         (
        NSStoreType = SQLite;
        NSStoreUUID = "9B3D312C-95C8-45E3-9F2F-2581E88403A8";
        "_NSAutoVacuumLevel" = 2;
    reason = "The model used to open the store is incompatible with the one used to create the store";

Answer 1

That is not it.  I acually had it working with Mavaricks and ios7 and then something changed.   I am wondering what exactly is being compared when the The model used to open the store is incompatible with the one used to create the store error is thrown.  It is obviously not the columns of the db and properties of the managed objects because they are identical.