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Error: Could not find destination site for login!

You will get this error when you navigate your STS (sign-in) site directly. You should not directly navigate to STS site, it should redirected by SharePoint. For example if you navigate directly and sign-it with an OpenID provider then you will get that error because STS does not know which SharePoint Site need to be signed-in. One STS can support all of your farms of your corporation so STS does not know target SharePoint site you if someone directly navigate it .
You should press sign-in link in your SharePoint site and SharePoint should redirect to STS site automatically.