I just update my theme Avada to the latest version.

hello.
I just update my theme Avada to the latest version.
Everything is working perfect except Google+
error receive...
Fatal error: Class 'Google_ServiceResource' not found in /var/www/vhosts/holistic-therapies.gr/ygeia-enarmonisi/wp-content/plugins/wpmu-dev-plusone/lib/external/google/contrib/Google_PlusService.php on line 25