outbound plug, confusing error message: no navigational link attached
I just finished the WebDynpro Quiz tutorial and deployed the application. Unfortunately when pressing the start button the application dumps and I get a stack trace
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Cannot navigate via outbound plug StartQuizOut of view WelcomeView because there is no navigational link attached to it at com.sap.tc.webdynpro.progmodel.view.View.navigate(View.java:349) ...
indicating that there was no navigational link attached to my plug StartQuizOut. However the link is definitly there.
As sources are not provided I cannot debug into the class named in the trace.
Could someone please give me a hint. I think I did everything according to the tutorial, but I am stuck now.
P.S. I searched this forum for "no navigational link attached"; there are some threads with a similar problem description, but no solution is provided.