NullPointerException when running an app whose name ends in "Controller"

Repro:

1) griffon create-app AirTrafficController
2) cd AirTrafficController
3) griffon a
4) Behold the exception:

Launching application ...
2012-03-30 16:27:09,011 [main] INFO griffon.swing.SwingApplication - Initializing all startup groups: [airTrafficController]
2012-03-30 16:27:09,021 [main] ERROR griffon.util.GriffonExceptionHandler - Uncaught Exception
java.lang.NullPointerException
at org.codehaus.griffon.runtime.core.DefaultMVCGroupManager.selectClassesPerMember(DefaultMVCGroupManager.java:159)
at org.codehaus.griffon.runtime.core.DefaultMVCGroupManager.buildMVCGroup(DefaultMVCGroupManager.java:104)
at org.codehaus.griffon.runtime.core.AbstractMVCGroupManager.createMVCGroup(AbstractMVCGroupManager.java:238)
at org.codehaus.griffon.runtime.core.AbstractMVCGroupManager.createMVCGroup(AbstractMVCGroupManager.java:186)
at org.codehaus.griffon.runtime.core.AbstractGriffonApplication.createMVCGroup(AbstractGriffonApplication.java:499)
at org.codehaus.griffon.runtime.core.AbstractGriffonApplication.startup(AbstractGriffonApplication.java:313)
at griffon.swing.AbstractSwingGriffonApplication.realize(AbstractSwingGriffonApplication.java:78)
at griffon.swing.AbstractSwingGriffonApplication.run(AbstractSwingGriffonApplication.java:132)
at griffon.swing.SwingApplication.main(SwingApplication.java:36)