Help! Can't Update User Profiles

[mignonkm]

Hello, I am getting the following error on my 'edit user profile' page...the page and all the options shows up, but where the submit/update button should be the following error shows up instead:

Fatal error: Call to undefined method stdClass::has_cap() in /home/****/wp-content/plugins/s2member/includes/functions/user-access-level.inc.php on line 38

Any clue as to how I can fix this error? Thanks!!