An instance of nsfetchedresultscontroller requires a non-nil fetchrequest and managedobject context in iOS 10

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iPhone

iOS

iPad

Xcode

Swift

The code work good when I was using Xcode 7.3 with iOS 9 but when I migrated to Xcode 8 using swift 3 ,the code below show me that runtime error.still finding a solution for it

class TableViewController: UITableViewController,NSFetchedResultsControllerDelegate,UISearchResultsUpdating {

var fetchResultController :NSFetchedResultsController<Restaurant>!

var searchController : UISearchController!

var searchResults :[Restaurant] = []

override func viewDidLoad() {
super.viewDidLoad()



let fetchRequest : NSFetchRequest<NSFetchRequestResult> = Restaurant.fetchRequest()
let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]




if let managedObjectContext = (UIApplication.shared.delegate as? AppDelegate)?.managedObjectContext{



fetchResultController = NSFetchedResultsController(fetchRequest: fetchRequest as! NSFetchRequest<Restaurant>, managedObjectContext: managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)

fetchResultController.delegate = self

do{
try fetchResultController.performFetch()
restaurants = fetchResultController.fetchedObjects!
}
catch{
print(error)
}

}
}

What I have tried:

I have tried so many resources such as official documentation , developer forums as well as browse the web for it but didn't find anything