Why openerp javascript tutorial fail ?

I try to do the tutorial: doc.openerp.com/trunk/web/module/ I test the same code: Example Client Actionexample.action And i get this error: File "/opt/openerp/src/server/openerp/tools/convert.py", line 632, in _tag_menuitem "Verify that this is a window action or add a type argument." % (a_action,) AssertionError: No window action defined for this id action_client_example ! i found other people with the same problem: foro.openerp.org.ar/index.php?t=msg&th=402&rid=0 but no answers :(