Exception no controlada del tipo 'System.AggregateException' en Tweetinvi.WebLogic.dll

Jul 25, 2015 at 6:53 AM
hi,
References the library "Tweetinvi" the project and wrote the following:
   TwitterCredentials.SetCredentials ("2907 ..............." "nVqVw .............", "ma ........ ...... "" SW9 ................. ")

         'Publish the Tweet "Hello World" on your Timeline
         Tweet.PublishTweet ("Hello World!")

but returns error, attached image.
please help.
thanks

version Tweetinvi 0.9.8.1
https://www.dropbox.com/s/9szeepmmfd5mkdr/tweet.jpg?dl=0