I get the error "exceptions.AttributeError" when I try to do an "up2date --undo", what does this mean?

Updated -

Release Found: Red Hat Enterprise Linux 4

Symptom:

When performing the command #up2date --undo the following message may appear:

# up2date --undo
An error has occurred:
exceptions.AttributeError
See /var/log/up2date for more information

An associated output in /var/log/up2date can be seen:<...>

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