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TTR
05-09-2011, 01:00 AM
I am trying to run a world when I use arrow keys to move and I get this error and it shuts down the simulation :( It only seems to happen when I release the move forward or backwards key. Any idea what is causing it?



Error during simulation.




Alice version: 2.2 09/10/2010



Throwable that caused the error:

java.lang.NullPointerException

at edu.cmu.cs.stage3.alice.core.Behavior$RuntimeStack .pop(Behavior.java:49)

at edu.cmu.cs.stage3.alice.core.Behavior.popStack(Beh avior.java:367)

at edu.cmu.cs.stage3.alice.core.response.CallToUserDe finedResponse$RuntimeCallToUserDefinedResponse.epi logue(CallToUserDefinedResponse.java:99)

at edu.cmu.cs.stage3.alice.core.behavior.AbstractCond itionalBehavior.internalSchedule(AbstractCondition alBehavior.java:114)

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(Unknown Source)

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

at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)

at java.awt.Dialog$1.run(Unknown Source)

at java.awt.Dialog$3.run(Unknown Source)

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

at java.awt.Dialog.show(Unknown Source)

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

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

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

at java.awt.Dialog.setVisible(Unknown Source)

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:5165)

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

at javax.swing.AbstractButton.fireActionPerformed(Unk nown 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.mouseRe leased(Unknown Source)

at java.awt.AWTEventMulticaster.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(U nknown Source)

at java.awt.LightweightDispatcher.dispatchEvent(Unkno wn 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.pumpOneEventForFilter s(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)

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

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

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

DensetsuNoKaboom
05-09-2011, 04:37 PM
Could we see your world?

Often if you make a "while the key is pressed" method and make a method beyond just one action, it will give this error.