ApplicationNotAvailableException on handheld

We have installed Creme 3.24 and MI 2.5 on an Intermec CK31 handheld. It connects to the network and successfully syncs when we run MI, but the application it downloads during the sync will not start and the log files show the "ApplicationNotAvailableException" and "ClassNotFoundException" for the main class of the application. It acts like it is not finding the .jar file at all (it is an AWT application, not JSP). The same setup works fine on a laptop, but obviously there is some configuration difference somewhere.

Any clues as to where else to look?

Thanks,

Adam