iCalendar
Access to account “AOL” is not permitted.
The server responded:
“403”
to operation CalDAVAccountRefreshQueueableOperation.
How can I fix this?
In the Mac's Calendar app, select the Calendar menu > Accounts... which will open Internet Account Preferences.
Select your AOL account from the left column, and de-select Calendars. For assistance with your AOL account you will need to contact them.