Wp super cache error!!!

Hello I just updated Wp Super Cache and and new sub items to the menu and save menu after save menu I get this errors:

basedir restriction in effect. File(/) is not within the allowed path(s): (/home/sb2017/:/tmp:/var/tmp:/usr/local/lib/php/:/usr/local/php56/lib/php/) in /home/(myusername)/domains/social-boost.nl/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 677

Is there anybody to help me out?