I am getting a pop up window that says "The Calendar calendar does not support events" You can't add events to the Calendar calendar

I recently did some HD clean up and I'm plagued by this window. I can get it to go away briefly if I restart the computer but it always comes back.
Weird!

Hi wcb82,
If you keep getting these messages, you may need to delete the subscription to that calendar. You may find the following article useful:
Cal 5.x: Delete a calendar or reminder list
http://support.apple.com/kb/PH4720
Regards,
- Brenden

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