Why do I get the following message when I attempt to delete a completed reminder, "Couldn't delete 'reminder 1'. Dialog.Error.Text.Reminder.DESTROY.QUOTA_EXCEEDED?
Since there is no batch delete for Reminders on iPhone or iPad, I went to iCloud.com to delete old, completed reminders. Alas, I was able to successfully delete only ONE completed reminder from a total of 1221. Trying to delete all at once only resulted in my getting the error message 1,220 times! Signing in and then out (or out, then in) of iCloud did not make a difference. Restarting my iMac did not make a difference. (I am using OS X El Capitan, v. 10.11.6 and Safari v. 9.1.2)
P.S.: Trying to update a reminder resulted in a similar message — "...UPDATE.QUOTA_EXCEEDED"