This piece of code was working properly until I Introduced the Exercise Model. I have tried everything like using migration scheme, removing the app, cleaning build folder, trying on different devices and simulator. Nothing seems to work now. I can't get the app to launch. struct LogbookApp: App { @State private var sharedModelContainer: ModelContainer = { let schema = Schema([ Workout.self, Exercise.self ]) let modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false) do { return try ModelContainer(for: schema, configurations: [modelConfiguration]) } catch(let error) { fatalError("Could not create ModelContainer: \(error)") } }() var body: some Scene { WindowGroup { MainCoordinator() .view() } .modelContainer(sharedModelContainer) } } The models look like this @Model final class Exercise { var name: String var workout: Workout? init(name: String, workout: Workout? = nil) { self.name = name self.workout = workout } } @Model final class Workout { @Attribute(.unique) var id = UUID() @Relationship(deleteRule: .cascade) var exercises: [Exercise]? var type: WorkoutType var date: Date var duration: Int var customDescription: String init(id: UUID = UUID(), type: WorkoutType, date: Date, duration: Int, customDescription: String = "", exercises: [Exercise]? = []) { self.id = id self.type = type self.date = date self.duration = duration self.customDescription = customDescription self.exercises = exercises } }