Fatal Error after upgrade

I just upgraded my site to 3.2.1 and now I’m receiving the following error on any page associated with my site:

Fatal error: Call to undefined method Arras_Widget_Tag_Cloud::WP_Widget_Tag_Cloud() in /home/content/c/g/o/cgoggin/html/wp-content/themes/arras/library/widgets.php on line 404

I’m unable to get into the cms to change anything and the front end is not appearing either. All I see on any of these pages is that error and then a lot of white space. Anyone have any suggestions on how I might be able to troubleshoot this?

Thanks!