c# - Windows Phone 8.1 Live SDK 5.6 Login issue -


i following windows live sdk 5.6 example codes , have own simple app trying login onedrive. microsoft account given step step, seems fine, however, system.nullreferenceexception, when application goes page again, when click single button:

private async void signinbtn_click(object sender, routedeventargs e)     {          try         {             authclient = new liveauthclient();             system.diagnostics.debug.writeline("authclient = " + authclient);              loginresult = await authclient.loginasync(new string[] { "wl.signin", "wl.skydrive", "wl.skydrive_update", "wl.photos" });              if (loginresult.status == liveconnectsessionstatus.connected)             {                  liveclient = new liveconnectclient(loginresult.session);                 var meresult = await liveclient.getasync("me");                 system.diagnostics.debug.writeline(meresult.result["name"].tostring() + ", " + "you have logged in onedrive!");             }          }         catch (liveauthexception authexp)         {             system.diagnostics.debug.writeline("liveauthexception = " + authexp.tostring());         }          catch (liveconnectexception connexp)         {             system.diagnostics.debug.writeline("liveconnectexception = " + connexp.tostring());         }     }

it throws exception @ line:

loginresult = await authclient.loginasync(new string[] { "wl.signin", "wl.skydrive", "wl.skydrive_update", "wl.photos" });

anything goes wrong in codes? referred sample codes?

try passing list instead of string array:

public static async task<liveloginresult> loginasync() {     list<string> onedrivescopes = new list<string>() { "wl.signin", "wl.basic", "wl.skydrive_update" };     liveauthclient authclient = new liveauthclient();     liveloginresult authresult;     try     {         authresult = await authclient.loginasync(onedrivescopes);     }     catch     {         return null;     }     return authresult; }

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