Tom and Gary, thanks so much. Tom, was exactly the same problem !!!.
Gary, I will review my knowledge about python following your advice ;)


-----Original Message-----
From: Tom Dossis [mailto:[EMAIL PROTECTED] 
Sent: Monday, October 03, 2005 8:09 PM
To: Leticia Larrosa
Subject: Re: [Zope3-Users] object has no attribute '_SampleContainer__data'

Leticia Larrosa wrote:
> When a try to see the view of list of "Service" of one of the
> I get the following error:
> """
> 'Service' object has no attribute '_SampleContainer__data'
> """
> I'm newcomer in zope 3 and any idea will be appreciated.
> Thanks in advance.
> Leticia Larrosa

In addition to the previous reply; I experienced the above problem when..

I implementend a simple subclass of SampleContainer, then changed to 
subclass BTreeContainer, but forget to delete existing instances created 
in Zope.  A tell tale sign is you can no longer delete the broken 


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