Xzone has fatal error

If i activate the xzone plugin an fatal error will apear:

Fatal error: Uncaught Error: Call to undefined function fgetss() in /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/modules/setup_backup/default-sql.php:111 Stack trace: #0 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/modules/setup_backup/default-sql.php(69): WooZoneSetupBackup->install_tables_data('/customers/c/c/...') #1 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/modules/setup_backup/default-sql.php(165): WooZoneSetupBackup->__construct() #2 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/modules/setup_backup/default-sql.php(174): WooZoneSetupBackup::getInstance() #3 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/aa-framework/framework.class.php(7713): require_once('/customers/c/c/...') #4 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/aa-framework/framework.class.php(7787): WooZone->check_if_table_exists(false) #5 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/aa-framework/framework.class.php(8411): WooZone->update_db(false) #6 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/aa-framework/framework.class.php(765): WooZone->plugin_integrity_check(Array, false) #7 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-includes/class-wp-hook.php(292): WooZone->activate('') #8 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array) #9 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #10 /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-admin/plugins.php(193): do_action('activate_woozon...') #11 {main} thrown in /customers/c/c/c/fahrradkauf.store/httpd.www/shop/wp-content/plugins/woozone/modules/setup_backup/default-sql.php on line 111 

What is the error?