ical susbcription error

I previously added a subscription to iCal with a URL. It wasn't refreshing the new data as the calendar changed, so I deleted the calendar and added it later on. However, the new calendar wouldn't upload to iCal. It keeps giving me the following error message: There was an unexpected error with the request on subscribed calendars (error -1).

Anyone know how to fix this?

Thanks for any and all help!!