[Zope] Failed saving version

[Art Hampton]

I went to save a version (called 'NewHeader') on the Save/Discard tab,
and I got an error:


Zope Error
Zope has encountered an error while publishing this resource. 

Error Type: KeyError
Error Value: ~

--------------------------------------------------------------------------------

Here's the traceback:

Traceback (innermost last):
  File /usr/local/zope/Zope-2.1.0-src/lib/python/ZPublisher/Publish.py,
line 214, in publish_module
  File /usr/local/zope/Zope-2.1.0-src/lib/python/ZPublisher/Publish.py,
line 179, in publish
  File /usr/local/zope/Zope-2.1.0-src/lib/python/Zope/__init__.py, line
202, in zpublisher_exception_hook
    (Object: RoleManager)
  File /usr/local/zope/Zope-2.1.0-src/lib/python/ZPublisher/Publish.py,
line 169, in publish
  File /usr/local/zope/Zope-2.1.0-src/lib/python/ZODB/Transaction.py,
line 237, in commit
  File /usr/local/zope/Zope-2.1.0-src/lib/python/ZODB/DB.py, line 576,
in commit
  File /usr/local/zope/Zope-2.1.0-src/lib/python/ZODB/FileStorage.py,
line 480, in commitVersion
    (Object: /usr/local/zope/Zope-2.1.0-src/var/Data.fs)
KeyError: (see above)


To state the obvious, I'm running Zope 2.1.0 compiled from the source.

Any help is appreciated.