This generally happens with mounted databases, and can occur with Core Session Tracking as a result. Dieter Maurer wrote:
For the archives:
Today, I used a Zope 2.3.3 to extend an application.
Suddenly, Zope reported "Attribute error, getUserByName".
I check the log file and found "Could not load lots of "<Object id>", "None" object has not method "load".
Restarting Zope let the problem disappear.
I am unaware, that I did any special things before the problem occured.
Dieter
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