libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

class Settings: SKScene{
 let backToMenuButton = SKSpriteNode(imageNamed: "BlackArrow1.0")

 override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches{
        let locationUser = touch.location(in: self)
        if atPoint(locationUser) == backToMenuButton {
            let transition = SKTransition.crossFade(withDuration: 0.2)
            let mainMenu1 = mainMenu(size: self.size)
            self.view?.presentScene(mainMenu1, transition: transition)
        }
       }
      }
     }