Error editing Symbolics lispm namespace

When I try to edit the namespace on my MacIvory, I get the error:

":AUTHOR is not a changeable property in the Macintosh file system.
For HOST:Mac O/S 7.6.1:System 
Folder:Ivory:Namespace:standalone-objects.TEMP"

I'm running Genera 8.3 on a MacIvory II.  Has anyone seen this error 
before or know what I can do about it?

Thanks,

   --Bruce