[Zope] import error

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>