How to use this?

[yoonjason]

`import UIKit
import ASHorizontalScrollView

class ViewController: UIViewController {

@IBOutlet weak var scrollView: ASHorizontalScrollView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    
    scrollView.removeAllItems()
   //Thread 1:EXC_BAD_ACCESS (code = 2, address = 0x11199a9e8)

   scrollView.uniformItemSize = CGSize(width: 80, height: 50)
  //Thread 1:EXC_BAD_ACCESS (code = 2, address = 0x11199a9e8)
}

}
`

Thread 1:EXC_BAD_ACCESS (code = 2, address = 0x11199a9e8)

what is first settings?