"unrecognized selector sent to instance" error when adding ViewController

Question

I've recently attempted to add a welcome screen to my AR app that works as a Home screen. When the app loads, the user can tap the button and then the app freezes, crashes and displays the code

 "Thread 1: "-[_0_2_2020_2.WelcomeViewController letsGo:]: unrecognized selector sent to instance 0x13ec05e00"

• I've tried a few of the solutions available, but I haven't been able to come up with a solution. I think it has something to do with my *IBAction connection. Any assistance is greatly appreciated!

   import UIKit
   import RealityKit
   import ARKit
  
   class WelcomeViewController: UIViewController {
  
  
  
    @IBAction func gotPressed(_ sender: Any) {let storyboard = UIStoryboard(name: "Main", 
    bundle: nil)
       if let viewController = storyboard.instantiateViewController(withIdentifier: 
   "ViewController") as? ViewController {
        self.present(viewController, animated: true, completion: nil) /// present the view 
   controller (the one with the ARKit)!
    }    }
  
  
  }
  
  
  
    class ViewController: UIViewController, ARSessionDelegate {
       //delay app launch to show splash screen
      func application(_ application: UIApplication, didFinishLaunchingWithOptions 
    launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
          Thread.sleep(forTimeInterval: 3.0)
          // Override point for customization after application launch.
          return true
     }
   //end splash screen delay
   @IBOutlet var arView: ARView!
  
    override func viewDidLoad() {
    super.viewDidLoad()
  
    arView.session.delegate = self
  
    showModel()
    overlayCoachingView()
    setupARView()
  
    arView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap(recognizer:))))
  
    }
  
  func showModel(){
  
    let anchorEntity = AnchorEntity(plane: .horizontal, minimumBounds:[0.7, 0.7])
  
    anchorEntity.scale = [0.2, 0.2, 0.2]
  
      let entity = try! Entity.loadModel(named: "COW_ANIMATIONS")
      entity.setParent(anchorEntity)
  
      arView.scene.addAnchor(anchorEntity)
  
  
    }
  //Overlay coaching view "adjust iphone scan"
  func overlayCoachingView () {
  
    let coachingView = ARCoachingOverlayView(frame: CGRect(x: 0, y: 0, width: arView.frame.width, height: arView.frame.height))
  
    coachingView.session = arView.session
    coachingView.activatesAutomatically = true
    coachingView.goal = .horizontalPlane
  
    view.addSubview(coachingView)
  
  }//end overlay
  
  
  func setupARView(){
    arView.automaticallyConfigureSession = false
    let configuration = ARWorldTrackingConfiguration()
    configuration.planeDetection = [.horizontal, .vertical]
    configuration.environmentTexturing = .automatic
    arView.session.run(configuration)
  }
  
  //object placement
  
  @objc
  func handleTap(recognizer: UITapGestureRecognizer){
    let location = recognizer.location(in:arView)
  
    let results = arView.raycast(from: location, allowing: .estimatedPlane, alignment: .horizontal)
  
    if let firstResult = results.first {
        let brownCowAnchor = ARAnchor(name: "COW_ANIMATIONS", transform: firstResult.worldTransform)
        arView.session.add(anchor: brownCowAnchor)
    } else {
        print("Object placement failed - couldn't find surface.")
  
  
  
        //cow animations
        //let robot = try! ModelEntity.load(named: "COW_ANIMATIONS")
       let brownCowAnchor = AnchorEntity()
        let blackCowAnchor = AnchorEntity()
  
        //anchor.children.append(robot)
        //arView.scene.anchors.append(anchor)
  
        //robot.playAnimation(robot.availableAnimations[0].repeat(duration: .infinity),
                                                      //transitionDuration: 0.5,
                                                            //startsPaused: false)
  
        //start cow animation
  
  
        let brownCow = try! ModelEntity.load(named: "COW_ANIMATIONS")
        let blackCow = try! ModelEntity.load(named: "Cow")
  
        brownCow.position.x = -1.0
        blackCow.position.x = 1.0
        brownCowAnchor.position.z = -2.0
        blackCowAnchor.position.z = -2.0
        brownCow.setParent(brownCowAnchor)
        blackCow.setParent(blackCowAnchor)
        arView.scene.anchors.append(brownCowAnchor)
        arView.scene.anchors.append(blackCowAnchor)
  
        let cowAnimationResource = brownCow.availableAnimations[0]
        let horseAnimationResource = blackCow.availableAnimations[0]
  
        brownCow.playAnimation(cowAnimationResource.repeat(duration: .infinity),
                                            transitionDuration: 1.25,
                                                  startsPaused: false)
  
        blackCow.playAnimation(horseAnimationResource.repeat(duration: .infinity),
                                                transitionDuration: 0.75,
                                                      startsPaused: false)
  
        //end cow animations
    }
  }
  
  func placeObject(named entityName: String, for anchor: ARAnchor)  {
    let entity = try! ModelEntity.loadModel(named: entityName)
  
    entity.generateCollisionShapes(recursive: true)
    arView.installGestures([.rotation, .translation], for: entity)
  
  
    let anchorEntity = AnchorEntity(anchor: anchor)
    anchorEntity.addChild(entity)
    arView.scene.addAnchor(anchorEntity)
  
  
  }
  }
  

Answer 1

The button is triggering a function letsGo which doesn't appear anywhere on the WelcomeViewController you posted. Check interface builder and make sure that you've removed the old connection from the button. Should be the final tab.