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The process for installing and connecting to Google Connect is really a two step process. The installation is straight forward but then I'm guessing that you're seeing some error at the end of the process?
This really can be disregarded as the site can't connect with GFC while you are in the builder. As soon as your publish the installed GFC you will probably see that it will now connect?
It's a common issue. If this isn't the issue then get back here and tell us what you are experiencing.