App crashes with fatal error for setting image to CustomViewCell - swift

Question

I have created an UICollectionView with custom UICollectioViewCell with just an image view. When I try add an image to the image view in the cell it crashes with
fatal error: unexpectedly found nil while unwrapping an Optional value.
I'm unable to figure out where i'm getting the nil value from.
Below is my code for the CollectionViewController.
class CollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
let reuseIdentifier = "Cell"
#IBOutlet weak var menuButton: UIBarButtonItem!
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView!.registerClass(PhotoViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: UICollectionViewDataSource
override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! PhotoViewCell
// Configure the cell
cell.backgroundColor = UIColor.grayColor()
cell.cellImageView.image = UIImage(named:"IMG_1635")// The code crashes here....
return cell
}
func collectionView(collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}
// Code for Custom Cell
class PhotoViewCell: UICollectionViewCell {
#IBOutlet weak var cellImageView: UIImageView!
}
The app runs fine when on removing the following line cell.cellImageView.image = UIImage(named:"IMG_1635")

Answer 1

Try:
cell.cellImageView.image = UIImage(named:"IMG_1635")