syntax error in latest s2member update

I just updated s2member with the most recent update this morning. After reactivation, I get this message (and a dead website!):
wp-content/plugins/s2member/includes/classes/no-cache.inc.php(156) : eval()'d code on line 1
Please fix as soon as possible.
wp-content/plugins/s2member/includes/classes/no-cache.inc.php(156) : eval()'d code on line 1
Please fix as soon as possible.