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iOS

Help! " JSON dictionary returns nil for current key "

Help! I keep getting "JSON dictionary returns nil for current key" in console and also the current weather isn't changing in my Stormy App

import Foundation

class NetworkOperations {

   lazy var config: NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()

    lazy var session: NSURLSession = NSURLSession(configuration: self.config)
    let queryURL: NSURL

    typealias JSONDictionaryCompletion = ([String: AnyObject]?) ->Void

    init(url: NSURL) {
        self.queryURL = url

    }

    func downloadJSONFromURL(completion: JSONDictionaryCompletion) {

        let request: NSURLRequest = NSURLRequest(URL: queryURL)
        let dataTask = session.dataTaskWithRequest(request) {
            (let data, let response, let error) in

            if let httpResponse = response as? NSHTTPURLResponse {

                switch(httpResponse.statusCode) {
                case 200:

                    let jsonDictionary = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as? [String: AnyObject]
                    completion(jsonDictionary)

                default:
                    println("not working")

                }

            }else {
                println("Error not Valid")
            }
}
        dataTask.resume()      
}
}