Google Plus Plugin not Authenticating API

After installing and following the directions I am still unable to authenticate my account.

I receive the error message "Error: redirect_uri_mismatch"
but the URI I am using is the exact match of the one that was recommended by the plugin which is my site address "'Authorized Redirect URIs'":

I'm not sure the next steps necessary to make a connection between the site and the Google Plus page. Any help would be appreciated. Thanks