Install error

Following error when click on install

PHP Fatal error:  Uncaught Error: Class 'ZipArchive' not found in /var/www/html/wordpress/wp-content/plugins/easyappointments/core/Operations/Install.php:103\nStack trace:\n#0 /var/www/html/wordpress/wp-content/plugins/easyappointments/core/Operations/Install.php(69): EAWP\\Core\\Operations\\Install->unzipFiles()\n#1 /var/www/html/wordpress/wp-content/plugins/easyappointments/core/Plugin.php(99): EAWP\\Core\\Operations\\Install->invoke()\n#2 /var/www/html/wordpress/wp-content/plugins/easyappointments/core/Route.php(88): EAWP\\Core\\Plugin->EAWP\\Core\\{closure}()\n#3 /var/www/html/wordpress/wp-includes/class-wp-hook.php(288): EAWP\\Core\\Route->EAWP\\Core\\{closure}('')\n#4 /var/www/html/wordpress/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters('', Array)\n#5 /var/www/html/wordpress/wp-includes/plugin.php(478): WP_Hook->do_action(Array)\n#6 /var/www/html/wordpress/wp-admin/admin-ajax.php(175): do_action('wp_ajax_install')\n#7 {main}\n  thrown in /var/www/html/wordpress/wp-content/plugins/easyappointments/core/Operations/Install.php on line 103, referer: http://172.16.4.49/wp-admin/options-general.php?page=eawp-settings