tutorial ErrorBehavior method from tutorial is undefined

Hi,

every time I try to use the <i>reportInvalidContextAttributeMessage</i> method in the ErrorBehavior project, like it is suggested in tutorial 3, NetWeaver Developer Studio informs me that this method is undefined for the type <i>IWDMessageManager</i>.

I did the necessary imports like adviced in the tutorial.

Can anyone please help me in finding a solution?

Regards,

Stefan