[Zope] TypeError: Cache values must be persistent objects.

[Nikko Wolf]

Nikko Wolf wrote:
> Help!
> 
> I'm trying to develop a filesystem-based Product (here 'ABCD') and 
> unless I remove the "ABCD" folder from my Products directory, I get the 
> following error IN THE MANAGEMENT INTERFACE.
> 
> Is it possible to determine what's causing the problem?  After multiple 
> restarts, I did a global "Find" in the ZMI and (I think) deleted all 
> objects of type "ABCD Content".  But still the problem persists (no pun 
> intended).
> 
> Gaah!  How can I fix this?

Well, with the "ABCD" product folder moved, I restarted Zope.  Then, in 
the ZMI I manually looked at every folder in which I thought there was 
the slightest chance that I might have added an XML_File object.

After a while, I found one in a folder beneath the Plone instance.  I 
delete that, restarting Zope with ABCD back where it belonged, this 
seems to have fixed the problem this time.

But that begs the questions
  + why didn't the stack backtrace give the problem ID?
  + if "0x28b5" can be deciphered as an ID, how?
  + why didn't the Find locate the broken instance? (it *might*
    be since I've created about 15 different portal_types, and
    the "ABCD Content" wasn't really what the offending ID was).
  + is this a common problem with file-system (or ZClass) products?

Phew,
Nikko