Basic questions:
Are these errors occurring when your shop is setup with a Google Checkout sandbox account or a live/production account?
From your previous post regarding .htaccess issue it appears you are running PHP as CGI. Are you certain that is true? Your host can tell you.
If you are certain running PHP as CGI you can visit Ropu's site and use his generator to create an .htaccess file.
http://demo.globant.com/~brovagnati/tools/
When did your error occur? Immediately after you click the the GCO checkout image on your shop?
What does the error log report? response_error.php
What was the effect when you uninstalled authorize.net payment module? Any difference?
Woody
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