errors encountered while discovering extensions: Error Domain=PlugInKit Code=13 "query cancelled"

I am trying to display or upload UIImage and I am getting this error.

"errors encountered while discovering extensions: Error Domain=PlugInKit Code=13 "query cancelled" UserInfo={NSLocalizedDescription=query cancelled}"

import UIKit

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate { 

// linked labels and UiButtons

@IBOutlet weak var ifix: UILabel!
@IBOutlet weak var UIImage: UIImageView!
let someImageView: UIImageView = {
    let theImageView = UIImageView()
    theImageView.translatesAutoresizingMaskIntoConstraints = false // call this property so the image is added to your view
    return theImageView
}()


@IBAction func UploadImage(_ sender: UIButton) {
    let myPickerController = UIImagePickerController()
    myPickerController.delegate = self;
    myPickerController.sourceType =  UIImagePickerController.SourceType.photoLibrary
    self.present(myPickerController, animated: true, completion: nil)

}
    @objc func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any])
    {
        let image_data = info[UIImagePickerController.InfoKey.originalImage] as? UIImage
        let imageData:Data = image_data!.pngData()!
        _ = imageData.base64EncodedString()
        self.dismiss(animated: true, completion: nil)
    }


@IBAction func UIShuffle(_ sender: UIButton) {
}


@IBAction func UIReset(_ sender: UIButton) {
}

override func viewDidLoad() {
    super.viewDidLoad()
    // additional setup after loading the view, typically from a nib.
    view.addSubview(someImageView) //This add it the view controller without constraints
    someImageViewConstraints() //This function is outside the viewDidLoad function that controls the constraints

}
//  `.isActive = true` after every constraint
func someImageViewConstraints() {
    someImageView.widthAnchor.constraint(equalToConstant: 180).isActive = true
    someImageView.heightAnchor.constraint(equalToConstant: 180).isActive = true
    someImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    someImageView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 28).isActive = true


}

}