Swift: Thread 1 signal SIGABRT in class AppDelegate: UIResponder, UIApplicationDelegate - ios

Question

Whenever I try to open a different view controller with a show segue it crashes with this error Swift: Thread 1 signal SIGABRT in class AppDelegate: UIResponder, UIApplicationDelegate, I don't know why.
Here's the code of the View Controller that I try to open:
import UIKit
import CoreData
class AddEditVC: UIViewController, NSFetchedResultsControllerDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
var item : Item? = nil
#IBOutlet weak var itemName: UITextField!
#IBOutlet weak var imageHolder: UIImageView!
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
override func viewDidLoad() {
super.viewDidLoad()
if item != nil {
itemName.text = item?.name
imageHolder.image = UIImage(data: (item?.image)!)
}
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func addImage(sender: AnyObject) {
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
pickerController.allowsEditing = true
self.presentViewController(pickerController, animated: true, completion: nil)
}
#IBAction func addImageFromCamera(sender: AnyObject) {
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.sourceType = UIImagePickerControllerSourceType.Camera
pickerController.allowsEditing = true
self.presentViewController(pickerController, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
self.dismissViewControllerAnimated(true, completion: nil)
self.imageHolder.image = image
}
#IBAction func saveTapped(sender: AnyObject) {
if item != nil {
editItem()
} else {
createNewItem()
}
}
func createNewItem() {
let entityDescription = NSEntityDescription.entityForName("Item", inManagedObjectContext: moc)
let item = Item(entity: entityDescription!, insertIntoManagedObjectContext: moc)
item.name = itemName.text
item.image = UIImagePNGRepresentation(imageHolder.image!)
do {
try moc.save()
} catch {
return
}
}
func editItem () {
item?.name = itemName.text
item!.image = UIImagePNGRepresentation(imageHolder.image!)
do {
try moc.save()
} catch {
return
}
}

Answer 1

This error is usually appears when some of #IBOutlet or #IBAction is not assigned in the MainStoryboard.
Please check small circles before them. They should be grayed

Answer 2

It's either what Andriy is saying, or you executed a PerformSegueWithIdentifier(name, nil) with the wrong identifier. Best to add a screenshot of your storyboard & original controller as well to give a definite answer.
Good luck!