error after successful build

During the Java web gui tutorial one drags a list box,

binds a table from the travel db to it with typeid and display

description, then one tries to run.

It builds fine but when attempting to send display to browser,

I repeatedly get this error:

at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.ja va:285)

Is anyone familiaar with this and how to avoid it?

[430 byte] By [JohnHNa] at [2007-11-27 1:01:45]