Google Analytics for WP Dashboard fatal error

Ever since upgrading to the latest plugin I have been getting the following fatal error message: (I deleted plugin and reinstalled, but the same error comes up…thanks)

Fatal error: Uncaught exception ‘Google_AuthException’ with message ‘Error refreshing the OAuth2 token, message: ‘{ “error” : “unauthorized_client” }” in /homepages/21/d109324465/htdocs/wordpress-3.5/wordpress/wp-content/plugins/google-analytics-dashboard-for-wp/src/auth/Google_OAuth2.php:279 Stack trace: #0 /homepages/21/d109324465/htdocs/wordpress-3.5/wordpress/wp-content/plugins/google-analytics-dashboard-for-wp/src/auth/Google_OAuth2.php(239): Google_OAuth2->refreshTokenRequest(Array) #1 /homepages/21/d109324465/htdocs/wordpress-3.5/wordpress/wp-content/plugins/google-analytics-dashboard-for-wp/src/auth/Google_OAuth2.php(216): Google_OAuth2->refreshToken(‘1/XYuHOiqFr8Rdm…’) #2 /homepages/21/d109324465/htdocs/wordpress-3.5/wordpress/wp-content/plugins/google-analytics-dashboard-for-wp/src/service/Google_ServiceResource.php(167): Google_OAuth2->sign(Object(Google_HttpRequest)) #3 /homepages/21/d109324465/htdocs/wordpress-3.5/wordpress/wp-content/plugins/google-analytics-dashboard-for-wp/src/contrib/Google_Analytics in /homepages/21/d109324465/htdocs/wordpress-3.5/wordpress/wp-content/plugins/google-analytics-dashboard-for-wp/src/auth/Google_OAuth2.php on line 279