Update to 3.1.36 causes error

Fatal error: Uncaught Error: Class “Google_Service_Calendar” not found in wp-content/plugins/simple-calendar-google-calendar-pro/includes/feeds/google-pro.php:174

I am getting the above error when I visit the settings page of the Simple Calendar plugin. This same error is where the calendar is shown on the page. Does anybody have a resolution to this?

I am using PHP 8.0 and WordPress 6.0.2. But this didn’t work on an older version of PHP or WP.