-999 "cancelled" Error

A -999 error is NSURLErrorCancelled, which is documented as:

Returned when an asynchronous load is canceled.

Can you check if your app is accidentally calling .cancel() on the request by any chance?

Otherwise, I can't seem to reproduce this, so can you let us know:

• the code snippet you're using to reproduce this
• the version(s) of iOS you're seeing this with
• the version(s) of Xcode you're seeing this with

Thanks in advance! 

Thanks for the quick response!

Code Snippet:

import UIKit

import SwiftyDropbox

class ViewController: UIViewController {

   let accessToken = “not shown but is valid"

   override func viewDidLoad() {

        super.viewDidLoad()

    }

    @IBAction func button1Pressed(_ sender: UIButton) {

        let client = DropboxClient(accessToken: accessToken)

        client.files.listFolder(path: "").response { response, error in

            DispatchQueue.main.async() { guard error == nil else { return }  }

        }

    }

}

iOS Version: 10.0

Xcode Version: 8.0

Additional information: This endpoint was initially working in another project but then stopped working returning the same error message.  Now, whenever a new project is created the error message is returned on all endpoints.  Any suggestions on areas I can investigate?  

That was the problem.  Thanks!