Error when trying to activate

Hi, I was trying to activate the plugin on a new WP Multisite network, is the first plugin and WordPress is using everything as default.

Fatal error: Uncaught Error: Call to undefined function mysql_error() in /srv/users/[edited for privacy]/public/wp-content/plugins/zanto/includes/zanto-activation.php:93 Stack trace: #0 /srv/users/[edited for privacy]/public/wp-content/plugins/zanto/classes/class.zwt-settings.php(75): zwt_initial_activate() #1 /srv/users/[edited for privacy]/public/wp-content/plugins/zanto/classes/class.zwt-base.php(209): ZWT_Settings->activate() #2 /srv/users/[edited for privacy]/public/wp-content/plugins/zanto/classes/class.zwt-base.php(183): ZWT_Base->singleActivate() #3 /srv/users/[edited for privacy]/public/wp-includes/plugin.php(525): ZWT_Base->activate('') #4 /srv/users/[edited for privacy]/public/wp-admin/plugins.php(166): do_action('activate_zanto/...') #5 {main} thrown in /srv/users/[edited for privacy]/public/wp-content/plugins/zanto/includes/zanto-activation.php on line 93

Thanks in advance for any help.

Regards,
https://www.ads-software.com/plugins/zanto/