Rails devise and twitter

Hi all

I'm following this guide:

http://railscasts.com/episodes/235-omniauth-part-1?language=it&view=asciicast

when I try to connect by twitter (localhost:3000 or 127.0.0.1:3000) I
obtain this message:

OAuth::Unauthorized

401 Unauthorized

In this link http://coreywoodcox.com/omniauth-and-twitter I read that I
have to check Application type client in twitter but I cannot find the
twitter page?

could you help me please? ora could you suggest me a basic tutorial?

I'm not sure what you're trying to do, but if you want to create a
twitter app, suggest starting at http://dev.twitter.com/docs