Hello Shane,

I think that you're right about the persistent to non-persistent
changes and vice-versa. I will try to identify the object that does

What do you mean by removing add-ons? You mean products? And if I
remove my third party products and make the objects which subclass the
ATFolder broken then I will not get the necessary upgrades specific to
folders right?

Thanks for your input,

On 21 November 2011 21:05, Shane Hathaway <sh...@hathawaymix.org> wrote:
> On 11/21/2011 10:40 AM, Alexandru Plugaru wrote:
>> Hello,
>> I've got this error ( http://pastie.org/2898828 ) while upgrading from
>> plone3 to plone4. The context in which that error happens is this:
>> http://pastie.org/2898959
>> The only place I could find the error message was in cPersistence.c:
>> http://svn.zope.org/*checkout*/ZODB/branches/3.9/src/persistent/cPersistence.c
>> So I guess my question is how do I know if an object is cached? And
>> maybe a theory of why this is happening.
> That kind of thing happens when a class changes from non-persistent to
> persistent or vice-versa. This may be caused by add-ons. When I do a major
> Plone upgrade, I first disable all add-ons temporarily and that usually does
> the trick.
> If that doesn't work, I suggest you get a list of all your add-ons and ask
> this question on a Plone list.
> Shane
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