yahoo authentication

I'm developing a sample app on my localhost which tries to connect to yahoo, bu t I got an error message : Sorry! You will not be able to link your Yahoo! account with this website or application. It is using an older version of the OpenID technology. The url is: http://open.login.yahooapis.com/openid/op/auth?oauth_token=&oauth_callback=http%3A%2F%2Fconnectmezend.dev%2Fyahoocallback. Can i ask what's the problem?Maybe the value for oauth_token is blank?Please help.Thank you so much