Fatal Error While installing Cloner.

Hey Y'all.

I'm trying to install Cloner on my portfolio site. This is the error I'm getting when I try to activate the plugin? Any ideas? Is this a known issue?

"Fatal error: Call to undefined function is_subdomain_install() in /var/www/vhosts/g66l-fqlb.accessdomain.com/new.benstacey.ca/wp-content/plugins/cloner/integration/integration.php on line 93"