NSData error Making a Network Call in the weather app

import UIKit

class ViewController: UIViewController {

    private let apiKey = "The api Key I put in*"

    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/forecast/\(apiKey)/")
        let forecastURL = NSURL(string: "Coordinate of my location*, coordinate of my location*", 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.
    }


}