Forminator conflict with Simple Calendar

While Forminator activated on my website, I can’t activate Simple Calendar plugin. It generates fatal error like this;

Fatal error: Cannot redeclare google_api_php_client_autoload() (previously declared in /wp-content/plugins/forminator/addons/pro/googlesheet/lib/external/Google/autoload.php:18) in /wp-content/plugins/google-calendar-events/vendor/google/apiclient/src/Google/autoload.php on line 30