I am receiving the following errors every 15 seconds:

Permission Error. Changes to the event "Management Meeting" could not be saved because you do not have the appropriate permission.
Permission Error. Changes to the event "" could not be saved because you do not have the appropriate permission.

I have narrowed it down to a calendar that is being shared with me. When I remove the shared calendar the error messages go away. When I add it back the error messages come back.

How can I make the error messages stop?