[Grok-dev] Upgrade problem "type object 'IRole' has no attribute '__iro__'"

Wichert Akkerman wichert at wiggy.net
Wed May 28 06:02:57 EDT 2008

Previously Sebastian Ware wrote:
> When upgrading a live grok-0.10 app to grok-0.12 I get the following  
> error:
>   AttributeError: type object 'IRole' has no attribute '__iro__'
> I am guessing it has to do with the move of zope.securitypolicy, but  
> how do I resolve this?

The last few times I've seen that __iro__ error it apparently had
something to do with persisted interface. I've never been able to find a
fix for it, or reliably reproduce it.


Wichert Akkerman <wichert at wiggy.net>    It is simple to make things.
http://www.wiggy.net/                   It is hard to make things simple.

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