[Plugin: Every Calendar 1 for WordPress] 404 on qtip

I am getting a 404 error in Firebug for qtip:

Failed to load resource: the server responded with a status of 404 (Not Found) – http://domain.com/wp-content/plugins/every-calendar-1/qtip2/jquery.qtip.min.css?ver=3.3.1

http://wordpress.org/extend/plugins/every-calendar-1/