plone.app.multilingual 2.0a2 can not be installed

I just updated a testbed with plone 4.3.3-pending.
Now trying to install plone.app.multilingual into a vanilla plone site 
produces the following error.

robert

Traceback (innermost last):
   Module ZPublisher.Publish, line 138, in publish
   Module ZPublisher.mapply, line 77, in mapply
   Module ZPublisher.Publish, line 48, in call_object
   Module Products.CMFPlone.browser.admin, line 206, in __call__
   Module Products.CMFPlone.factory, line 105, in addPloneSite
   Module Products.GenericSetup.tool, line 350, in 
runAllImportStepsFromProfile
    - __traceback_info__: profile-plone.app.multilingual:default
   Module Products.GenericSetup.tool, line 1100, in 
_runImportStepsFromContext
   Module Products.GenericSetup.tool, line 1015, in _doRunImportStep
    - __traceback_info__: typeinfo
   Module Products.CMFCore.exportimport.typeinfo, line 225, in 
importTypesTool
   Module Products.GenericSetup.utils, line 838, in importObjects
    - __traceback_info__: portal_types
   Module Products.GenericSetup.utils, line 834, in importObjects
    - __traceback_info__: types/Document
   Module Products.GenericSetup.utils, line 509, in _importBody
   Module Products.CMFCore.exportimport.typeinfo, line 60, in _importNode
   Module Products.GenericSetup.utils, line 730, in _initProperties
ValueError: undefined property 'behaviors'


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