If you encounter this problem when adding a new instance of one of your custom-written content types:

Traceback (innermost last):
  Module ZPublisher.Publish, line 119, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 42, in call_object
  Module Products.CMFPlone.FactoryTool, line 368, in __call__
  Module Products.CMFPlone.FactoryTool, line 152, in __getitem__
  Module Products.CMFPlone.PloneFolder, line 348, in invokeFactory
  Module Products.CMFCore.TypesTool, line 716, in constructContent
  Module Products.CMFCore.TypesTool, line 278, in constructInstance
  Module Products.CMFCore.TypesTool, line 290, in _finishConstruction
  Module Products.CMFCore.CMFCatalogAware, line 148, in notifyWorkflowCreated
  Module Products.CMFCore.WorkflowTool, line 291, in notifyCreated
  Module Products.DCWorkflow.DCWorkflow, line 346, in notifyCreated
  Module Products.DCWorkflow.DCWorkflow, line 430, in _changeStateOf
  Module Products.DCWorkflow.DCWorkflow, line 529, in _executeTransition
  Module Products.DCWorkflow.DCWorkflow, line 389, in updateRoleMappingsFor
  Module Products.DCWorkflow.utils, line 64, in modifyRolesForPermission
  Module AccessControl.Permission, line 93, in setRoles
  Module Products.Archetypes.fieldproperty, line 101, in __get__
  Module Products.Archetypes.Field, line 1666, in get
  Module Products.Archetypes.Referenceable, line 82, in getRefs
  Module Products.CMFCore.utils, line 123, in getToolByName
AttributeError: reference_catalog

The problem is probably that you have added so-called bridges from Archetype fields to python properties, but without observing that reference fields must be bridged using atapi.ATReferenceFieldProperty - just using ATFieldProperty for a ReferenceField will cause the above error.