PHP Stream Errors

I am getting following errors after activating the plugin and going to the Settings page.

Note: I replaced the actual path from the root to the plugin in the messages below.

Warning: include_once(/path-to-plugin/wp-content/plugins/simplybookme-online-appointment-scheduling-widget-and-booking-system/modules/class/Template.class.php): failed to open stream: No such file or directory in /path-to-plugin/wp-content/plugins/simplybookme-online-appointment-scheduling-widget-and-booking-system/modules/admin-page.php on line 8

Warning: include_once(): Failed opening ‘path-to-plugin/wp-content/plugins/simplybookme-online-appointment-scheduling-widget-and-booking-system/modules/class/Template.class.php’ for inclusion (include_path=’.:/opt/php54/lib/php’) in /path-to-plugin/wp-content/plugins/simplybookme-online-appointment-scheduling-widget-and-booking-system/modules/admin-page.php on line 8

The issue looks to be an invalid path call to Template.class.php here:

/simplybookme-online-appointment-scheduling-widget-and-booking-system/modules/class/Template.class.php

There is no directory called “class” under modules. The only files under that directory are .htaccess and admin-page.php.