How to clean up old interfaces on zc.relation catalog?

Question

I was using plone.directives.form version 1.0 with Plone 4.2.5 and after upgrading to 4.2.6 I started seeing the following traceback and I guess its due to plone.

Answer 1

The Schema class is now in plone.supermodel.model, not plone.directives.form.schema.

However, the real problem you should try to fix is that the code is for some reason trying to store a schema in the ZODB. Pickling/unpickling Zope interfaces is not supported.