[Zope] [Zope]login manager error

[Owen Smith]

on zope startup I get this

zope@phonix:/usr/local/dc/zope$ ------
2000-08-01T13:39:45 ERROR(200) Zope Couldn't import
Products.LoginManager
Traceback (innermost last):
  File /usr/local/dc/zope/lib/python/OFS/Application.py, line 396, in
import_products
    (Object: string)
  File /usr/local/dc/zope/lib/python/Products/LoginManager/__init__.py,
line 1, in ?
  File
/usr/local/dc/zope/lib/python/Products/LoginManager/LoginManager.py,
line 9, in ?
ImportError: cannot import name SheetProviderContainer

help!

Thanks
Owen