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Я скопировал стек coredata из нового проекта в существующий проект, и я получаю данные из API и помещаю их в coredata при запуске приложения, но случайно происходит сбой. Вот мой журнал:

  *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet addObject:]: attempt to insert nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010605a34b __exceptionPreprocess   171
    1   libobjc.A.dylib                     0x0000000105abb21e objc_exception_throw   48
    2   CoreFoundation                      0x00000001060c3265  [NSException raise:format:]   197
    3   CoreFoundation                      0x0000000105ff262b -[__NSCFSet addObject:]   155
    4   CoreData                            0x0000000101f025bb -[NSManagedObjectContext(_NSInternalChangeProcessing) _processPendingInsertions:withDeletions:withUpdates:]   603
    5   CoreData                            0x0000000101efcc6c -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:]   2348
    6   CoreData                            0x0000000101f04449 -[NSManagedObjectContext(_NSInternalChangeProcessing) _prepareForPushChanges:]   185
    7   CoreData                            0x0000000101f00ea2 -[NSManagedObjectContext save:]   562
    8   ETKA                                0x00000001014f73a5 _TFC4ETKA11AppDelegate11saveContextfT_T_   149
    9   ETKA                                0x0000000101500d71 _TFC4ETKA11AppDelegate8saveJsonfT_T_   6113
    10  ETKA                                0x00000001014ff459 _TFFC4ETKA11AppDelegate10parseJSON1FT_T_U_FTGSqV10Foundation4Data_GSqCSo11URLResponse_GSqPs5Error___T_   31257
    11  ETKA                                0x0000000101422b8b _TTRXFo_oGSqV10Foundation4Data_oGSqCSo11URLResponse_oGSqPs5Error____XFdCb_dGSqCSo6NSData_dGSqS1__dGSqCSo7NSError___   203
    12  CFNetwork                           0x00000001088d26b0 __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke   19
    13  CFNetwork                           0x00000001088d1f5c __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke   308
    14  Foundation                          0x00000001055bf2cd __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__   7
    15  Foundation                          0x00000001055befaf -[NSBlockOperation main]   101
    16  Foundation                          0x00000001055bd6ac -[__NSOperationInternal _start:]   672
    17  Foundation                          0x00000001055b95ef __NSOQSchedule_f   201
    18  libdispatch.dylib                   0x0000000106f350cd _dispatch_client_callout   8
    19  libdispatch.dylib                   0x0000000106f12e6b _dispatch_queue_serial_drain   236
    20  libdispatch.dylib                   0x0000000106f13b9f _dispatch_queue_invoke   1073
    21  libdispatch.dylib                   0x0000000106f163b7 _dispatch_root_queue_drain   720
    22  libdispatch.dylib                   0x0000000106f1608b _dispatch_worker_thread3   123
    23  libsystem_pthread.dylib             0x00000001072e4746 _pthread_wqthread   1299
    24  libsystem_pthread.dylib             0x00000001072e4221 start_wqthread   13
)
libc  abi.dylib: terminating with uncaught exception of type NSException
(lldb) 
  

и вот мой код в AppDelegate:

 import UIKit
import GoogleMaps
import CoreData

@available(iOS 10.0, *)
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var nrows = 0
    var namesArray = [String]()
    var codeArray = [String]()
    var rankingArray = [String]()
    var mornStart = [String]()
    var mornEnd = [String]()
    var eveStart = [String]()
    var eveEnd = [String]()
    var addressArray = [String]()
    var telArray = [String]()
    var latArray = [String]()
    var lngArray = [String]()
    var cityArray = [String]()
    var iDArray = [String]()
    var locss = [Locs]()

     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        // Override point for customization after application launch.
         parseJSON1()


        GMSServices.provideAPIKey("AIzaSyDsDqj0EMYZ-C4lGF3tmbntZtzurLl6_J4")

        return true
    }

    func applicationWillResignActive(application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(application: UIApplication) {
        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.




    }

    func applicationDidBecomeActive(application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }
    // MARK: - Core Data stack

    @available(iOS 10.0, *)
    lazy 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: "Model")
        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

    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } 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)")
            }
        }
    }



    func parseJSON1(){



        let requestURL: NSURL = NSURL(string: "xxxxxxx")!
        let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
        let session = URLSession.shared
        let task = session.dataTask(with: urlRequest as URLRequest) {
            (data, response, error) -> Void in


            let readableJSON = JSON(data: data! , options: JSONSerialization.ReadingOptions.mutableContainers, error: nil)

            var Name = readableJSON[0]["Name"].stringValue as String!
            print(Name)
            self.nrows = readableJSON.count

            for i in 0...self.nrows{

                if let Name = readableJSON[i]["Name"].string as String! {
                    var ID = readableJSON[i]["Id"].intValue
                    var iDString = String (ID)
                    self.namesArray.append(Name)
                    var code1 = readableJSON[i]["Code"].string as String!
                    if code1 == nil {

                        code1 = " "
                    }
                    var desc = readableJSON[i]["Address"].string as String!
                    if desc == nil {

                        desc = " "
                    }
                    var rank = readableJSON[i]["Ranking"].string as String!

                    if rank == nil {

                        rank = " "
                    }
                    var cit = readableJSON[i]["Province"].string as String!
                    if cit == nil {

                        cit = " "
                    }
                    var moS = readableJSON[i]["Morning_Start"].string as String!

                    if moS == nil {

                        moS = " "
                    }
                    var moF = readableJSON[i]["Morning_Finish"].string as String!
                    if moF == nil {
                        moF = " "
                    }
                    var evS = readableJSON[i]["Evening_Start"].string as String!
                    if evS == nil {

                        evS = " "
                    }
                    var evF = readableJSON[i]["Evening_Finish"].string as String!
                    if evF == nil {

                        evF = " "
                    }

                    var tel = readableJSON[i]["Telephone"].string as String!

                    if tel == nil {

                        tel = " "
                    }
                    var lat = readableJSON[i]["Lat"].double


                    let latString = String (describing: lat)
                    var lng = readableJSON[i]["Lng"].double

                    var lngString = String (describing: lng)


                    var newLoc = Locs(iD: iDString, state: cit!, name: Name, type: rank!, code: code1!, wHoursMorning: moS!   moF!, wHoursEvening: evS!   evF!, address: desc!, phone: tel!, lat: latString, lng: lngString)

                    self.locss.append(newLoc)

                     print(Name)


                }







                //  self.idArray.append(iDString)

               // print(Name)
                print (self.nrows)



            }
            /* for j in 0...self.nrows {

             print(self.namesArray[j])
             }*/
             self.saveJson()

        }
        task.resume()
        saveJson()


    }

    func saveJson() {
        /*   let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
         let task = Task(context: context)
         task.name = textField.text
         task.isImportant = isImp.isOn

         //save the data into coredata

         (UIApplication.shared.delegate as! AppDelegate).saveContext()*/

         for i in 0 ..< self.locss.count{
        let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
        let store = Store(context: context)
        store.name = self.locss[i].name
        store.address = self.locss[i].address
        store.city = self.locss[i].state
        store.code = self.locss[i].code
        store.morningStart = self.locss[i].wHoursMorning
        store.eveningStart = self.locss[i].wHoursEvening
        store.telephone = self.locss[i].phone
        store.lat = self.locss[i].lat
        store.lng = self.locss[i].lng
        store.ranking = self.locss[i].type
        store.iD = self.locss[i].iD

    (UIApplication.shared.delegate as! AppDelegate).saveContext()
           print("savedddd")



        }





    }



}