Exception while using Custom STS in ProcessSignInResponse – Windows Identity Foundation : A solution

This is just a small post. Last few days I was working on Custom Identity provider. I created a STS site using the Visual studio template “ASP.NET Security Token Service Website” .
I also created the my new website that was actually going to use the above STS as Identity Provider. I added the STS reference to my new website using VS IDE.
Now When I ran my application I was redirected first to Login page of STS that was as expected. I got happy but as soon as I clicked on login, there was an exception. And the exception message was

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.”

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