Changed domain names and calendar not redirecting.

We changed our entire website from ruach1.org to ruach.org. The page with the calendar (ruach.org/calendar) seems to be working. However, the calendar looks like it is still looking at ruach1.org.

The line of code is:
<link rel=’stylesheet’ id=’ai1ec_style-css’ href=’//www.ruach1.org/wp-content/plugins/all-in-one-event-calendar/cache/fb2c52fb_ai1ec_parsed_css.css?ver=2.5.10′ type=’text/css’ media=’all’ />

I am not sure where in WordPress to change this. We are using the Headway Theme (and they have not answered anyone’s support tickets in a month and a half so I can’t go there for help). Any ideas would be greatly appreciated.

Thanks.

https://www.ads-software.com/plugins/all-in-one-event-calendar/