Thread 1 breaking at downloadTask with (lldb) out puting on console

//
//  ViewController.swift
//  Stormy
//
//  Created by Dino Alves on 2015/01/15.
//  Copyright (c) 2015 Futre. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    private let apiKey = "xxxx"


    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: "37.8267,-122.423", relativeToURL: baseURL)!

        let sharedSession = NSURLSession.sharedSession()

        let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location:NSURL!, response:NSURLResponse!, error:NSError!) -> Void in

            if(error == nil){
                let dataObject = NSData(contentsOfURL: location)
                let weatherDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject!, options: nil, error: nil) as NSDictionary
                println(weatherDictionary)
            }


        })

        downloadTask.resume()
    }

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


}