[Zope] Undo error

[Bo M. Maryniuck]

I always have a trouble to undo something.
Zope: 2.5, not updated
OS: Linux SuSE 8.0 Pro
Session is on ZODB, not in temp folder.

Anybody know what this error means and how to avoid this?

Error Type: UndoError
Error Value: Couldn't undo change to '\x00\x00\x00\x00\x00\x00\x1c4' beca=
use non-undoable transaction

Traceback (innermost last):
  File /opt/zope/lib/python/ZPublisher/Publish.py, line 150, in publish_m=
odule
  File /opt/zope/lib/python/ZPublisher/Publish.py, line 114, in publish
  File /opt/zope/lib/python/Zope/__init__.py, line 159, in zpublisher_exc=
eption_hook
    (Object: newTask)
  File /opt/zope/lib/python/ZPublisher/Publish.py, line 102, in publish
  File /opt/zope/lib/python/Zope/__init__.py, line 173, in commit
  File /opt/zope/lib/python/ZODB/Transaction.py, line 234, in commit
  File /opt/zope/lib/python/ZODB/DB.py, line 590, in commit
  File /opt/zope/lib/python/ZODB/FileStorage.py, line 1134, in transactio=
nalUndo
    (Object: /opt/zope/var/Data.fs)
  File /opt/zope/lib/python/ZODB/FileStorage.py, line 1169, in _txn_undo
    (Object: /opt/zope/var/Data.fs)
  File /opt/zope/lib/python/ZODB/FileStorage.py, line 1260, in _txn_undo_=
write
    (Object: /opt/zope/var/Data.fs)
UndoError: (see above)

--=20
Regards, Bogdan

We've found by experience that people who are careless and sloppy writers=
 are
usually also careless and sloppy thinkers (often enough to bet on, anyway=
).
=09-- ESR (http://www.tuxedo.org/~esr/faqs/smart-questions.html)