IPhone Dev Error: “The model used to open the store is incompatible with the one used to create the store”;

You have probably changed the Core Data data model and are now trying to run your app in the simulator, however,, if you have already run it on the sim before then there will be data stored according to the old version of the data model. Quick solution: reset the simulator “IPhone Simulator > Reset Content and Settings” and try running your app again. Correct solution: look at versioning your data models.

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