[Zope] install CMFDocMgt

Dear Sir I am using Zope 2.6, now I want to install CMFDocMgt but it does not work, it has an erro like this when I start the Zope 2003-12-19T16:01:52 ERROR(200) Zope Could not import Products.CMFDocMgt Traceback (innermost last): Module OFS.Application, line 541, in import_product Module Products.CMFDocMgt, line 9, in ? Module Products.CMFDocMgt.config, line 3, in ? ImportError: No module named Archetypes.public Coul you tell me how to install CMFDocMgt, I also install RevisionManager Product.