Gives some errors

Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/kocuj-sitemap.php on line 159 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 190 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 686 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 686 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 686 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 715 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 715 Deprecated: Call-time pass-by-reference has been deprecated in /var/www/wordpress/wp-content/plugins/kocuj-sitemap/classes/kocuj-admin-1/kocuj-admin.class.php on line 715

Would be nice if this could be fixed as there does not seem to be any decent working sitemap for wordpress.

http://ww.wp.xz.cn/plugins/kocuj-sitemap/