TweetSharp - TwitterService send direct message

开发者_StackOverflow中文版i am using the latest version of tweetsharp from their site (TweetSharp.Next - Version 2 preview 7)

whenever i try and call SendDirectMessage on the twitter service:

TwitterDirectMessage dm = TwitterService.SendDirectMessage("UserImSendingTo", "My twitter message");

i get an error:

Argument
Value cannot be null.\r\nParameter name: types

What is going on? I'm definitely authenticated as i can do everything else - is there a bug in TweetSharp?

This has been solved by the latest release of tweet sharp