Hi,

I just tried upgrading a Plone 2.5 site to Plone 4.0b1.

I did it in two steps :

- first, upgrade to 3.3.5 ; it succeded

- second, upgrade from 3.3.5 to 4.0b1 which failed with the following traceback

Traceback (innermost last): Module ZPublisher.Publish, line 135, in publish Module Zope2.App.startup, line 276, in commit Module transaction._manager, line 93, in commit Module transaction._transaction, line 322, in commit Module transaction._transaction, line 416, in _commitResources Module ZODB.Connection, line 550, in commit Module ZODB.Connection, line 1128, in savepoint Module ZODB.Connection, line 606, in _commit Module ZODB.Connection, line 640, in _store_objects Module ZODB.serialize, line 415, in serialize Module ZODB.serialize, line 424, in _dump PicklingError: Can't pickle <class 'Products.PluginIndexes.TextIndex.TextIndex.TextIndex'>: import of module Products.PluginIndexes.TextIndex.TextIndex failed

AFAICS, it happens during the transaction commit that follows the upgrade code.

I have no idea how to debug efficiently ?

Any hint appreciated.

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