I run an error running funnelweb

I install funnelweb using this buildout:

```
[buildout]
parts += funnelweb

[funnelweb]
recipe = funnelweb
```

And when I run "bin/funnelweb --help" I got the next error:

```
Traceback (most recent call last):
File "bin/funnelweb", line 118, in
import mr.migrator.runner
File "/home/daniel/.buildout/eggs/mr.migrator-1.0.1-py2.6.egg/mr/migrator/runner/__init__.py", line 1, in
from collective.transmogrifier.transmogrifier import configuration_registry
File "/home/daniel/.buildout/eggs/collective.transmogrifier-1.3-py2.6.egg/collective/transmogrifier/transmogrifier.py", line 8, in
from Products.CMFCore.interfaces import IFolderish
File "/home/daniel/.buildout/eggs/Products.CMFCore-2.3.0_beta2-py2.6.egg/Products/CMFCore/__init__.py", line 18, in
import PortalFolder
File "/home/daniel/.buildout/eggs/Products.CMFCore-2.3.0_beta2-py2.6.egg/Products/CMFCore/PortalFolder.py", line 24, in
from OFS.Folder import Folder
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/OFS/Folder.py", line 24, in
from webdav.Collection import Collection
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/webdav/Collection.py", line 30, in
from webdav.Resource import Resource
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/webdav/Resource.py", line 35, in
from OFS.event import ObjectClonedEvent
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/OFS/event.py", line 20, in
import OFS.interfaces
File "/home/daniel/.buildout/eggs/Zope2-2.13.19-py2.6.egg/OFS/interfaces.py", line 19, in
from zope.location.interfaces import IPossibleSite
ImportError: cannot import name IPossibleSite
```

Reproduce the issue from the shown buildout configuration by running bin/funnelweb --help. Trace the import chain through mr.migrator.runner, collective.transmogrifier, and Zope2 until the missing zope.location.interfaces.IPossibleSite symbol is reached. Done means the command starts successfully without this ImportError.

Written by the indexing model from the issue text.