Я не понимаю, почему мой код не работает. Вот:

class Test: NSURLSessionDataDelegate {

    func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {

        if(error == nil) {
            print("Hallo")
        } else {
            print(error?.userInfo)
        }
    }

    func createRequest() {

        let dictionary = [
            "mailAddress":"[email protected]",
            .....
        ]

        let nsData: NSData?
        do {
            nsData = try NSJSONSerialization.dataWithJSONObject(dictionary, options: NSJSONWritingOptions(rawValue:0))
        } catch _ {
            nsData = nil
        }

        let defaultConfigObject = NSURLSessionConfiguration.defaultSessionConfiguration()
        let defaultSession = NSURLSession(configuration: defaultConfigObject, delegate: self, delegateQueue: NSOperationQueue.mainQueue())
        let url = NSURL(string: "http:...")!
        let urlRequest = NSMutableURLRequest(URL: url)
        urlRequest.HTTPMethod = "POST"
        urlRequest.HTTPBody = nsData
        urlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
        let dataTask = defaultSession.dataTaskWithRequest(urlRequest)
        dataTask.resume()

    }
}

И ошибка:

Тип Test не соответствует протоколу NSObjectProtocol.

Есть идеи?