I am fairly new to python/zope, I am trying to install an address book module within zope and I am getting this error and can't figure out what I need to fix?

Traceback (most recent call last):
File "C:\Program Files\Plone 2\Zope\lib\python\OFS\Application.py", line 654, in import_product
product=__import__(pname, global_dict, global_dict, silly)
File "C:\Program Files\Plone 2\Zope\lib\python\Products\address_book\__init__.py", line 81, in ?
import address_book
File "C:\Program Files\Plone 2\Zope\lib\python\Products\address_book\address_book.py", line 78, in ?
import contact
File "C:\Program Files\Plone 2\Zope\lib\python\Products\address_book\contact.py", line 78, in ?
from Products.warp_framework import base_item, utilities, properties, \
File "C:\Program Files\Plone 2\Zope\lib\python\Products\warp_framework\__init__.py", line 68, in ?
import base_item, product_base_item
File "C:\Program Files\Plone 2\Zope\lib\python\Products\warp_framework\base_item.py", line 74, in ?
import api, property_manager, object_manager, \
File "C:\Program Files\Plone 2\Zope\lib\python\Products\warp_framework\property_manager.py", line 68, in ?
import properties
File "C:\Program Files\Plone 2\Zope\lib\python\Products\warp_framework\properties\__init__.py", line 69, in ?
from feet_and_metres import feet_and_metres_factory
File "C:\Program Files\Plone 2\Zope\lib\python\Products\warp_framework\properties\feet_and_metres.py", line 68, in ?
import length
File "C:\Program Files\Plone 2\Zope\lib\python\Products\warp_framework\properties\length.py", line 165, in ?
class length(
File "C:\Program Files\Plone 2\Zope\lib\python\App\class_init.py", line 61, in default__class_init__
TypeError: 'NoneType' object is not callable
Any suggestions how to fix this so the module will work?