Plugin could not be activated because it triggered a fatal error

I installed the Groundhogg plugin on a fresh multisite installation (WP Version 5.6) but am unable to activate it either at the network or the site level. It gives the message

Plugin could not be activated because it triggered a fatal error.

Fatal error: Uncaught Error: Call to a member function is_option_enabled() on null in /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/functions.php:186 Stack trace: #0 /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/user-syncing.php(11): Groundhogg\is_option_enabled('gh_sync_user_me...') #1 /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/plugin.php(337): Groundhogg\User_Syncing->__construct() #2 /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/plugin.php(257): Groundhogg\Plugin->init_components() #3 /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/plugin.php(374): Groundhogg\Plugin->init() #4 /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/plugin.php(239): Groundhogg\Plugin->__construct() #5 /home/rclilly6/public_html/sites/intui in /home/rclilly6/public_html/sites/intuitivelifecoachllc.com/wp-content/plugins/groundhogg/includes/functions.php on line 186

The version of PHP on the server is 7.3.23