How do I delete the on my Mac calendar as it is competing with the iCloud calendar and giving me an error message

I am getting an error ménage in my iCloud calendar that says I can't add an event it must revert to the server . How can I delete the on my Mac calendar because I think it is competing with the iCloud calendar ?

Do you have the Yahoo toolbar? Other users have reported a similar JavaScript error when loading sites with that toolbar installed. If you have it, you could disable it or perhaps there is an updated version available.
If you don't have that toolbar, it could be one of your other add-ons. Check out cor-el's answer in this thread: [http://support.mozilla.com/en-US/questions/795003 When starting Firefox 4 I am presented with a JavaScript Application message "TypeError ksClass is undefined" | Firefox Support Forum | Firefox Help].

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