Item "255451" in collection "108" has no RID.

[test]

On Thursday, May 7, 2020 9:18:26 PM CEST John Scott wrote:
> Is it possible you've imported an event from an ICS? That caused me this
> error, after I copied it to my calendar for syncing. See
> https://bugs.kde.org/show_bug.cgi?id=419836
> 
> I think I might've used akonadiconsole to make it easier, but deleting the
> event from my calendar fixed it.

I tried to make an appointment in the calendar and never got it to work in 
that doesn't give any reminders.  I think the calendar managed to forget the 
appointment shortly after.  So I gave up on using the calendar; I don't really 
need one, and I wouldn't know how to keep keep it synced to the laptop.

So there may be some data there, with no way of removing it.