Rachel Bullie's dashboard

I have ical subscriptions that have worked for a long time, and today, all of them still worked except for one. They are all subscriptions to my Yahoo calendars, and like I said, just one of them received the "!" mark after trying to refresh. I click on the "!" mark, and receive the following error:

Error While Refreshing
Request encountered an unexpected error on subscribed calendars (code 4).

Seems to be a new issue since all my cal subscriptions worked before. Also seems pretty random since all my other calendars refreshed just fine.

I hope I can get an answer since this thread seems pretty old, but it's the only info I can find when I google the error! HELP!

Any ideas??

~Very Confused!!