iCal was unable to send the invitation.........To be able to send invitations, you need to create an address card for yourself in

Solution In your address book you should have a card identified as you (it will have a little icon by your picture (symbol) that same "ME". This is easy to set, just go to your card, then under the card menu select "Make this my card"

Not sure why that is required but I believe that is your issue.

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