On Tue, Jan 24, 2012 at 2:14 PM,  <li...@nidelven-it.no> wrote:
> It used to work, but with the most recent versions of
> Zope this error appears if the Undo by date is used
> more than once:

The undo API has changed with ZODB 3.10. As noted in the changelog:

"The API for undoing multiple transactions has changed. To undo
multiple transactions in a single transaction, pass a list of
transaction identifiers to a database's undoMultiple method. Calling a
database's undo method multiple times in the same transaction now
raises an exception."

Your code calls undo multiple times, and needs to be changed accordingly.

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