尝试将字段保存到CoreData时发出信号SIGABRT

Question

我正在尝试将多个字段保存到CoreData中，我有一个名为ArtworkSaved的实体，其中包含生成的子类（ArtworkSaved+CoreDataClass.swift和ArtworkSaved+CoreDataProperties）。

我也将persistentContainer从AppDelegate中移出，为其创建了一个新的自己的类PersistenceServ.swift

    class PersistenceServ
    {
    // MARK: - Core Data stack

private init() {}

static var context: NSManagedObjectContext {
    return persistentContainer.viewContext
}

static var persistentContainer: NSPersistentContainer = {
    /*
     The persistent container for the application. This implementation
     creates and returns a container, having loaded the store for the
     application to it. This property is optional since there are legitimate
     error conditions that could cause the creation of the store to fail.
     */
    let container = NSPersistentContainer(name: "NAME OF PROJECT")
    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            // Replace this implementation with code to handle the error appropriately.
            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

            /*
             Typical reasons for an error here include:
             * The parent directory does not exist, cannot be created, or disallows writing.
             * The persistent store is not accessible, due to permissions or data protection when the device is locked.
             * The device is out of space.
             * The store could not be migrated to the current model version.
             Check the error message to determine what the actual problem was.
             */
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()

// MARK: - Core Data Saving support

static func saveContext () {
    let context = persistentContainer.viewContext
    if context.hasChanges {
        do {
            try context.save()
            print("SAVED")
        } catch {
            // Replace this implementation with code to handle the error appropriately.
            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            let nserror = error as NSError
            fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
        }
    }
}

}

这在本节代码中被调用：

         func save(artworkPass:artwork)
{
    DispatchQueue.main.async {
        let saveArt = ArtworkSaved(context: PersistenceServ.context)

        saveArt.artist = artworkPass.artist
        saveArt.building = artworkPass.location
        saveArt.enabled = artworkPass.enabled
        saveArt.fileName = artworkPass.fileName
        saveArt.id = artworkPass.id
        saveArt.information = artworkPass.Information
        saveArt.lastModified = artworkPass.lastModifed

        let date = Date()
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        let result = formatter.string(from: date)

        saveArt.lastUpdate = result
        saveArt.lat = artworkPass.lat
        saveArt.locationNotes = artworkPass.locationNotes
        saveArt.long = artworkPass.long
        saveArt.title = artworkPass.title
        saveArt.yearOfWork = artworkPass.yearOfWork

        PersistenceServ.saveContext()
    }

，错误属于AppDelegate类。