Calendar and Reminders error

I am getting almost continuous error messages such as "The event "xxx" was rejected by "iCloud" because it already exists while I am in Calendar.
xxx is typicaly a task in reminders which I may have previously dismessed. I can Ignore or Revert to Server . . .
Why is this happening and how do I fix it?
Thank you.
Kano

Hi,
Could you please provide the exact error message so that we can narrow down the issue?
Meanwhile, please try to start Outlook with the cleanreminders switch to clear and regenerate reminders. To do this, press Windows key + R to open the
Run command, type outlook.exe /cleanreminders and press Enter.
Best Regards,
Steve Fan
TechNet Community Support

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