Help with error

Im getting the following error and have no idea on how to fix it without getting into the actual file:
Fatal error: Call to undefined function get_image_locations() in /home4/ab5577/public_html/wp-content/plugins/s2member/includes/classes/utilities.inc.php(48) : eval()’d code on line 100

Can anyone tell me how to fix it or how you can get into the files so I can edit it so it will work again.

Thank you