Sorry I missed this one.
So the stack ow uses your API key within Rapidweaver preview as well as the live site. So your key must be setup correctly.
Also if you have set domain specific security on the key, then that must include “127.0.0.1” or “localhost” in your list of referrers, as this is the preview url.
Google made the stack way to difficult to deploy now, hence it’s removal from Doobox a number of weeks ago.