This question is technically about Google OpenID solution, as opposed to OAuth.
As for the answer, it appears to me that the Google IDP issued a successful authentication statement that was not accepted by MyWinningTrade. There could be a configuration issue w/ your library, related to issue https://groups.google.com/forum/#!msg/google-federated-login-api/qXZDD7_K7jU/LfIp5JhFLAoJ
Unfortunately, from the time since last update, I am not sure if omniauth-openid is being actively maintained, so if this issue is affecting you, I hope you know how to rebuild your gem with the proper fixes. Let me know if I can help you sort out the change.