error message show up on the page is protected

When I click on the pages which are password protected, I get this error message at the top of the page.

Warning: Invalid argument supplied for foreach() in /home/capai0/public_html/wp-content/plugins/baw-multiple-pass-for-protected-pages/inc/frontend-noajax.inc.php on line 58

http://wordpress.org/extend/plugins/baw-multiple-pass-for-protected-pages/