Core-Data issue during app upgrade

On the process of updating an app to a newer version I am facing a problem related to Core-Data.

On the old version of the app, there is “theDB.sqlite” file. On the new version of the app, there are “theDB.sqlite”, “theDB.sqlite-shm” and “theDB.sqlite-wal” files instead.

Both versions work fine independently.

An issue arrises when a user has been using the old version for a while and makes an upgrade to the new version. I get a crash when the Core-Data DB is accessed.

I suppose I am doing something wrong in this method:

- (NSPersistentStoreCoordinator*)persistentStoreCoordinator

This code is probably not right:

    NSPersistentStore *thePersistentStore = [persistentStoreCoordinator
                                     addPersistentStoreWithType:NSSQLiteStoreType
                                     configuration:nil
                                     URL:storeURL
                                     options:nil
                                     error:&error];

But though I have tried many things, inspired by what I could find on the net, I can’t make it work.

I guess I could ask the user (as soon as I detect the problem in the app) to remove the old version before installing the new one. But if I can have a better solution, I want to avoid this kind of practice.