prime31 socialnetworking twitter cant login

I used the prime31's socialnetworking plugin,the facebook part is ok.But the twitter is not working.I used the function "TwitterBinding.showOauthLoginDialog()" ,and it works fine,when I call this "TwitterBinding.postStatusUpdate",it doesnt work ,and the xcode logout that"Twitter post failed: User is not logged in".I dont know how to loggin twitter...Can anyone tell me why and how i can do to slove the problem.Thans very much.