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

One more option, I developed a package called collective.diversion that is designed to ease the pain of pickling errors when moving a class. Neither of the above scripts worked for me, however using collective.diversion did.

Adding the package to the buildout and including the following ZCML caused the items to be loaded, and they'll be persisted back in the correct place on write, so reindexing the catalogue should be sufficient.