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The google API has moved from code.google.com to github, and the new API is totally different from what this module assumes.
https://github.com/google/google-api-php-client
It's still possible to get the old API from code.google.com, but you have to
svn checkout http://google-api-php-client.googlecode.com/svn/trunk/ google-api-php-client
For now, perhaps update the instructions?