After I updated from PayPlans 1.3.12 to 1.4.6 I get an error regarding my "home made" template on the front-end.

The error message:

JFile: :read: Can´t open file: /var/www/vhosts/ffatest.se/ffatest.se/httpdocs/components/com_payplans/media/themes/muscity/muscity.css

You can see the site with the error message here:

www.ffatest.se/medlemskap

Does someone know what is wrong?