Help with E exception in Walnut Tutorial Code

Hi all,
I just started using E, and decided to run through Mark Stiegler's tutorial.
 I copied the first set of code for the racetrack game under "Ordinary
Computing", and  ran it.  The 4 GUI windows show up with the buttons, and
racetrack.  I click the up button on the first car's control panel, and then
click submit.  I do the same for the other 2, but after I click submit in
the third window, the racetrack updates, and then I get the following
exception (By the way, I tried clicking them in different orders, no matter
what it always errors after the third submit):

C:\Erights>java -jar e.jar --rune ework/racetrack1.e-awt

accelerating car 1

racetrack reacting to accel

accelerating car 2

racetrack reacting to accel

accelerating car 3

racetrack reacting to accel

into move

got newlocation

assigned  location

got crash finish

out of move

into move

got newlocation

assigned  location

got crash finish

out of move

into move

got newlocation

assigned  location

got crash finish

out of move

into prepare for next turn

Exception in thread "AWT-EventQueue-0"
org.erights.e.develop.exception.NestedExc

eption: . <listener>.actionPerformed(java.awt.event.ActionEvent
[ACTION_PERFORMED

,cmd=Submit,when=1206759686640,...Icon=,rolloverSelectedIcon=,selectedIcon=,text

=Submit,defaultCapable=true])

        at org.erights.e.elib.prim.E.backtrace(E.java:256)

        at org.erights.e.elib.debug.CallCounter.bumpBadCount(
CallCounter.java:106)

        at org.erights.e.elang.evm.EMethodNode.execute(EMethodNode.java:139)

        at org.erights.e.elib.prim.E.callAll(E.java:164)

        at org.erights.e.elib.vat.Vat.callAll(Vat.java:498)

        at org.erights.e.elib.deflect.Deflector.invoke(Deflector.java:211)

        at $Proxy7.actionPerformed(Unknown Source)

        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

        at javax.swing.AbstractButton$Handler.actionPerformed(Unknown
Source)

        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown
Source)

        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown
Source)

        at java.awt.Component.processMouseEvent(Unknown Source)

        at javax.swing.JComponent.processMouseEvent(Unknown Source)

        at java.awt.Component.processEvent(Unknown Source)

        at java.awt.Container.processEvent(Unknown Source)

        at java.awt.Component.dispatchEventImpl(Unknown Source)

        at java.awt.Container.dispatchEventImpl(Unknown Source)

        at java.awt.Component.dispatchEvent(Unknown Source)

        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

        at java.awt.Container.dispatchEventImpl(Unknown Source)

        at java.awt.Window.dispatchEventImpl(Unknown Source)

        at java.awt.Component.dispatchEvent(Unknown Source)

        at java.awt.EventQueue.dispatchEvent(Unknown Source)

        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown
Source)


        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)

        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

        at java.awt.EventDispatchThread.run(Unknown Source)

Does anyone have any suggestions? Any help would be greatly appreciated.

Thanks,
Jimmy Wylie

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