[Zope] Can't create ZClass constructors

[Daniel Talas]

Hi there.

My ZOPE 2.6 installation has been working fine so far.  However, since
the last couple of days I can't create ZClasses constructor objects to
my product.  That is, I can create a ZClass, but only if I DO NOT check "Create constructor
objects?" checkbox.  If I DO check it and click on Add button, I get the following error:

Error Type: KeyError
Error Value: title

This happens if I try to add ZClass in any product.  Any clues how to fix this?

Thanks,
Daniel.