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I was making the cancel button of the memo screen in my iOS memo application. But, when I clicked the cancel button, Thread 1: EXC_BREAKPOINT (code=1, subcode=0x18855e560) error appeared. I used dismiss(animate: true, completion: nil) code ComposeViewController Code import UIKit class ComposeViewController: UIViewController { @IBAction func close(_ sender: Any) { dismiss(animated: true, completion: nil). //this code was problem } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. } //something more that is comment code '//' }