Infinite recursion error: __call__() in Plone 2.1
This is due to non-AT-based content being imported into a site that uses the new AT-based types as standard (as in plone 2.1)
After importing the content as usual try carrying out the following steps to migrate the content to the new AT-based types:
- run the recatalog cmf tool from the portal_atct tool in the ZMI (not required but recommended)
- browse to portal_atct/migrationFixCMFPortalTypes to invoke the fixing code. It makes sure that a CMF based Document gets the portal type name "CMF Document"
- after the cmf portal types have been fixed you can run the regular migration from the migration tab in portal_migrations.