There is an unknown user/calendar in iCal

Hello,
there ist an unknown user/calendar in iCal like on this picture with the name "Stefan Elbinger". I don't know who is it.
How can I delete this calendar?
Many thanks,
Bernhard Brause

This means that the Group ownership field has a Group ID that is not contained in /etc/group, so the Finder just substitutes 'unknown'.
There are 4 billion possible Group ID numbers, but only a handful are ever used.  Somehow you have stored a file on your system that is using a Group ID that does not contain a name in /etc/group
For example, if you received a ZIP file (or any other container file) and unpacked it, it is possible that the Group ID from another system was used when creating the file on your Mac.
You can use Applicaitons -> Utilities -> Terminal to change the group owner
sudo chgrp staff "/path/to/the/file.name"
Or you can just ignore this, as it is most likely harmless
Message was edited by: BobHarris

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