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' because non-undoable transaction Traceback (innermost last): File /opt/zope/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /opt/zope/lib/python/ZPublisher/Publish.py, line 114, in publish File /opt/zope/lib/python/Zope/__init__.py, line 159, in zpublisher_exception_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 transactionalUndo (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) -- 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). -- ESR (http://www.tuxedo.org/~esr/faqs/smart-questions.html)