xamarin.android - Getting Exception while calling the StartActivity -


i trying implement facebook , twitter login in xamarin android application using xamarin auth. while calling startactivity() method present facebook , twitter ui user authentication. getting exception shown in attached image.

public void facebooklogin() { var auth = new oauth2authenticator( clientid: "clientid", scope: "", authorizeurl: new uri("https://m.facebook.com/dialog/oauth/"), redirecturl: new uri("http://www.facebook.com/connect/login_success.html")); auth.allowcancel = true; auth.completed += facebookauth_completed; startactivity(auth.getui(this)); }

in above code, getting exception in calling startactivity(auth.getui(this)) presenting ui facebook. please find exception getting.

exception

i getting above exception , application crashes. please provide me suggestion. thanks.

regards,

vijay.


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