Hmm... I just ran the macro and it's working fine for me. That error is being thrown by a part of the code that checks error responses from the API. It may be settings related or it may be related to your API key.
First, double check that you have correctly entered your API key (copy and paste is the best approach, but even when you copy and paste it's possible to miss a character or add a space at the beginning or end of the key).
If you're certain that your API key is entered correctly, please post a screen shot of your macro settings dialog. (For directions to post an image in the GSAK forums, please see this post). (Make sure you remove or obsure your API key before pasting the screen shot).
First, double check that you have correctly entered your API key (copy and paste is the best approach, but even when you copy and paste it's possible to miss a character or add a space at the beginning or end of the key).
If you're certain that your API key is entered correctly, please post a screen shot of your macro settings dialog. (For directions to post an image in the GSAK forums, please see this post). (Make sure you remove or obsure your API key before pasting the screen shot).