NSData Error - Making a Network Call

    import UIKit

    class ViewController: UIViewController {

    private let apiKey = "PRIVATEAPIKEY"

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let baseURL = NSURL(string: "https://api.forecast.io/\(apiKey)/")
        let forecastURL = NSURL(string: "51.112124, -0.736092", relativeToURL: baseURL)

        let weatherData = NSData(
            contentsOfURL: forecastURL!,
            options: nil,
            error: nil
        )

        println(weatherData)


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    }