At plone startup with plone 4.0.3 :
File "/usr/local/Plone/buildout-cache/eggs/Products.PloneArticle-4.1.10-py2.6.egg/Products/PloneArticle/proxy/fileinnercontent.py", line 148, in <module>
registerType(FileInnerContentProxy)
TypeError: registerType() takes exactly 2 arguments (1 given)