iCloud calendar shows constant pop up on the bad URL 404 error message

Someone please help me with this. Its been going on for months and I am at my wits end. I can't use my calendar on my Mac at all without a constant pop up every few seconds telling me that my calendar iCloud server responded with an error 404. I've updated to El Capitan, when it came out but only had this problem from about 3 months ago. How can I fix it?

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Tags: Mac OS & System Software

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