Alice Community - Help with tutorial (basic)

My project is to create an environment where a coach, girl, and scientist are supposed to listen to the evil ninja when he commands them to kick (Tutorial 7-2 of the Starting Out With Alice 2e book). This is to be accomplished by using a list and the For All Together command. I got the ninja to give the command, but cannot get the group to respond. I attached my error message, and I would greatly appreciate any help with this dilemma. The actual problem reads:

[I] The evil ninja has started teaching karate classes to his three students. Create a world that shows the ninja commanding his students to practice kicking. Each time the ninja says "Kick!" the students will simultaneously kick with their right legs. The ninja commands them to kick five times.[/I]

Error during simulation.

Alice version: 2.2 12/01/2011

Throwable that caused the error:

java.lang.NullPointerException

at edu.cmu.cs.stage3.alice.core.question.PartKeyed.ge tValue(PartKeyed.java:40)

at edu.cmu.cs.stage3.alice.core.Property.evaluateIfNe cessary(Property.java:380)

at edu.cmu.cs.stage3.alice.core.Property.getValue(Pro perty.java:407)

at edu.cmu.cs.stage3.alice.core.property.ElementPrope rty.getElementValue(ElementProperty.java:37)

at edu.cmu.cs.stage3.alice.core.property.ReferenceFra meProperty.getReferenceFrameValue(ReferenceFramePr operty.java:37)

at edu.cmu.cs.stage3.alice.core.property.Transformabl eProperty.getTransformableValue(TransformablePrope rty.java:37)

at edu.cmu.cs.stage3.alice.core.response.TransformAni mation$RuntimeTransformAnimation.prologue(Transfor mAnimation.java:41)

at edu.cmu.cs.stage3.alice.core.response.DirectionAmo untTransformAnimation$RuntimeDirectionAmountTransf ormAnimation.prologue(DirectionAmountTransformAnim ation.java:54)

at edu.cmu.cs.stage3.alice.core.response.RotateAnimat ion$RuntimeRotateAnimation.prologue(RotateAnimatio n.java:40)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childPrologueIfNecessary(DoInOrder. java:53)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:100)

at edu.cmu.cs.stage3.alice.core.response.CallToUserDe finedResponse$RuntimeCallToUserDefinedResponse.upd ate(CallToUserDefinedResponse.java:89)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:58)

at edu.cmu.cs.stage3.alice.core.response.ForEachToget her$RuntimeForEachTogether.childUpdate(ForEachToge ther.java:74)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:101)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:58)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:101)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:58)

at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:101)

at edu.cmu.cs.stage3.alice.core.response.CallToUserDe finedResponse$RuntimeCallToUserDefinedResponse.upd ate(CallToUserDefinedResponse.java:89)

at edu.cmu.cs.stage3.alice.core.behavior.TriggerBehav ior.internalSchedule(TriggerBehavior.java:70)

at edu.cmu.cs.stage3.alice.core.Behavior.schedule(Beh avior.java:233)

at edu.cmu.cs.stage3.alice.core.Sandbox.scheduleBehav iors(Sandbox.java:70)

at edu.cmu.cs.stage3.alice.core.World.scheduleBehavio rs(World.java:457)

at edu.cmu.cs.stage3.alice.core.World.schedule(World. java:499)

at edu.cmu.cs.stage3.alice.core.clock.DefaultClock.sc hedule(DefaultClock.java:99)

at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l$7.run(AuthoringTool.java:693)

at edu.cmu.cs.stage3.alice.authoringtool.util.Default Scheduler.simulateOnce(DefaultScheduler.java:115)

at edu.cmu.cs.stage3.alice.authoringtool.util.Default Scheduler.run(DefaultScheduler.java:76)

at edu.cmu.cs.stage3.scheduler.AbstractScheduler.run( AbstractScheduler.java:45)

at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:209)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:641)

at java.awt.EventQueue.access$000(EventQueue.java:84)

at java.awt.EventQueue$1.run(EventQueue.java:602)

at java.awt.EventQueue$1.run(EventQueue.java:600)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:87)

at java.awt.EventQueue.dispatchEvent(EventQueue.java: 611)

at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:269)

at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:184)

at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:178)

at java.awt.Dialog$1.run(Dialog.java:1046)

at java.awt.Dialog$3.run(Dialog.java:1098)

at java.security.AccessController.doPrivileged(Native Method)

at java.awt.Dialog.show(Dialog.java:1096)

at java.awt.Component.show(Component.java:1584)

at java.awt.Component.setVisible(Component.java:1536)

at java.awt.Window.setVisible(Window.java:842)

at java.awt.Dialog.setVisible(Dialog.java:986)

at edu.cmu.cs.stage3.swing.DialogManager.showModalDia log(DialogManager.java:61)

at edu.cmu.cs.stage3.swing.DialogManager.showDialog(D ialogManager.java:131)

at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.play(AuthoringTool.java:5229)

at edu.cmu.cs.stage3.alice.authoringtool.Actions$16.a ctionPerformed(Actions.java:177)

at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1995)

at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2318)

at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:387)

at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:242)

at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:236)

at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:272)

at java.awt.Component.processMouseEvent(Component.jav a:6288)

at javax.swing.JComponent.processMouseEvent(JComponen t.java:3267)

at java.awt.Component.processEvent(Component.java:605 3)

at java.awt.Container.processEvent(Container.java:204 1)

at java.awt.Component.dispatchEventImpl(Component.jav a:4651)

at java.awt.Container.dispatchEventImpl(Container.jav a:2099)

at java.awt.Component.dispatchEvent(Component.java:44 81)

at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4577)

at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4238)

at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4168)

at java.awt.Container.dispatchEventImpl(Container.jav a:2085)

at java.awt.Window.dispatchEventImpl(Window.java:2478 )

at java.awt.Component.dispatchEvent(Component.java:44 81)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:643)

at java.awt.EventQueue.access$000(EventQueue.java:84)

at java.awt.EventQueue$1.run(EventQueue.java:602)

at java.awt.EventQueue$1.run(EventQueue.java:600)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:87)

at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:98)

at java.awt.EventQueue$2.run(EventQueue.java:616)

at java.awt.EventQueue$2.run(EventQueue.java:614)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:87)

at java.awt.EventQueue.dispatchEvent(EventQueue.java: 613)

at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:269)

at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:184)

at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:174)

at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:169)

at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:161)