Hi friends!

The CoreDataProject app keeps crashing on me and provides the following error: Thread 1: "An NSManagedObject of class 'Singer' must have a valid NSEntityDescription."

I've done the Googles and can not figure out how to fix this or what exactly is causing it.

Xcode Version 14.0.1 (14A400) iOS 16 target deploy

When you look at your data model is there an Entity named Singer there?

@Fly0strich,

Yes. It happens when any data model is created. Following along line for line with all topics on Day 57.

SOLVED: As it turns out, I left off the .environment section in the @main part of my app. Easy Fix!!!

import SwiftUI

@main struct CoreDataProjectApp: App { @StateObject private var dataController = DataController() var body: some Scene { WindowGroup { ContentView() .environment(.managedObjectContext, dataController.container.viewContext) } } }

You forgot the backslash \  for: managedObjectContext

\ . managedObjectContext

@KarVarr, it probably wasn't left out but because @leftHandedApps didn't properly format the code block, the forum stripped out the backslash.

@main 
struct CoreDataProjectApp: App { 
    @StateObject private var dataController = DataController() 
    var body: some Scene { 
        WindowGroup { 
            ContentView()
                .environment(\.managedObjectContext, dataController.container.viewContext) 
        } 
    } 
}

vs (with the backslash added back in before I posted):

@main struct CoreDataProjectApp: App { @StateObject private var dataController = DataController() var body: some Scene { WindowGroup { ContentView() .environment(.managedObjectContext, dataController.container.viewContext) } } }

Same code, different results. And yet another reason to always properly format code samples.