Error after upgrading

[dstrecker]

I just updated the S2 member plugin and now I am receiving this error:

Warning: Invalid argument supplied for foreach() in /home/selfdef/domains/dennystreckerskarate.com/public_html/students/wp-content/plugins/s2member/includes/functions/class-autoloader.inc.php on line 50

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/selfdef/domains/dennystreckerskarate.com/public_html/students/wp-content/plugins/s2member/includes/functions/class-autoloader.inc.php on line 30

I am no longer able to log into the site.

What did I do wrong and how do I fix it??????