[Plugin: The Google plugin] Authenticate not work

We’re getting the same error but are also unable to generate a Secret Key

Go to https://code.google.com/apis/console click API Access under “Client ID for web applications ” there must be a a link to your Page under “Redirect URIs:” if not click on the right side on “Edit settings” a new window open add your page url under the tab “Redirect URIs:” click update button.
Good luck