Problem in accessing SkyDrive using C# Windows Store App

Question

Hi Everyone,

I am developing an App for downloading the File (Doc,ppt or pdf) from skydrive. i found some reference

code here http://msdn.microsoft.com/en-us/library/dn659730.aspx

when i tried to use the code with my Visual Studio 2013 , i am getting error in the following line.

async private void Button_Click(object sender, RoutedEventArgs e)
        {


            bool connected = false;
            try
            {
                var authClient = new LiveAuthClient();
                LiveLoginResult result = await authClient.LoginAsync(new string[] { "wl.signin", "wl.skydrive" });

                if (result.Status == LiveConnectSessionStatus.Connected)
                {
                    connected = true;
                    var connectClient = new LiveConnectClient(result.Session);
                    var meResult = await connectClient.GetAsync("me");
                    dynamic meData = meResult.Result;
                    
                }
            }
            catch (LiveAuthException ex)
            {
                // Display an error message.
            }
            catch (LiveConnectException ex)
            {
                // Display an error message.
            }

Error Message:

An exception of type 'System.NullReferenceException' occurred in mscorlib.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object.

Please help me in that , i want to download files from skydrive (shared files  , so that we do not need to login)

Thanks,

Ashok r