[Zope] import error

[Michael Long]

I have exported a section of my site using the zmi export function. When
I try to import this site into a fresh installation of zope I get the
following error:
	Error Type:Bad Request
	Error Value:The id "Catalog" is invalid--it is already in use.

I have double and triple checked and there is not an id "Catalog"
anywhere to be found. I then tried importing it in a new folder back
onto the machine from which it was exported and get the same message.

What is does this message mean?

Thanks,
-- 
Michael Long <mlong@datalong.com>