Please explain error message:

[KGNorton]

We're receiving an "error during simulation" with detail that says "it cannot invert matrix." Does anyone have any ideas? Thanks.

[Lordelwood]

Im getting this error too now, never seen it before, i have the error log where it says it cant invert the matrix

Error during simulation.
Alice version: 2.0 04/05/2005
os.name: Windows NT (unknown)
os.version: 6.1
os.arch: x86
java.vm.name: Java HotSpot(TM) Client VM
java.vm.version: 1.3.1_10-b03
user.dir: D:\Alice\Alice\Required

Throwable that caused the error:
javax.vecmath.SingularMatrixException: cannot invert matrix
at javax.vecmath.Matrix4d.invertGeneral(Matrix4d.java :1996)
at javax.vecmath.Matrix4d.invert(Matrix4d.java:1951)
at edu.cmu.cs.stage3.alice.scenegraph.Transformable.g etInverseAbsoluteTransformation(Transformable.java :119)
at edu.cmu.cs.stage3.alice.scenegraph.Transformable.c alculateTransformation(Transformable.java:160)
at edu.cmu.cs.stage3.alice.scenegraph.Transformable.s etTransformation(Transformable.java:177)
at edu.cmu.cs.stage3.alice.scenegraph.Transformable.r otate(Transformable.java:325)
at edu.cmu.cs.stage3.alice.core.Transformable.rotateR ightNow(Transformable.java:689)
at edu.cmu.cs.stage3.alice.core.response.RotateAnimat ion$RuntimeRotateAnimation.update(RotateAnimation. java:57)
at edu.cmu.cs.stage3.alice.core.response.DoTogether$R untimeDoTogether.update(DoTogether.java:68)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:57)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:98)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:57)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:98)
at edu.cmu.cs.stage3.alice.core.response.CallToUserDe finedResponse$RuntimeCallToUserDefinedResponse.upd ate(CallToUserDefinedResponse.java:86)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:57)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:98)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:57)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:98)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:57)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:98)
at edu.cmu.cs.stage3.alice.core.response.CallToUserDe finedResponse$RuntimeCallToUserDefinedResponse.upd ate(CallToUserDefinedResponse.java:86)
at edu.cmu.cs.stage3.alice.core.response.DoTogether$R untimeDoTogether.update(DoTogether.java:68)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.childUpdate(DoInOrder.java:57)
at edu.cmu.cs.stage3.alice.core.response.DoInOrder$Ru ntimeDoInOrder.update(DoInOrder.java:98)
at edu.cmu.cs.stage3.alice.core.response.CallToUserDe finedResponse$RuntimeCallToUserDefinedResponse.upd ate(CallToUserDefinedResponse.java:86)
at edu.cmu.cs.stage3.alice.core.behavior.AbstractCond itionalBehavior.internalSchedule(AbstractCondition alBehavior.java:103)
at edu.cmu.cs.stage3.alice.core.Behavior.schedule(Beh avior.java:225)
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:444)
at edu.cmu.cs.stage3.alice.core.World.schedule(World. java:486)
at edu.cmu.cs.stage3.alice.core.clock.DefaultClock.sc hedule(DefaultClock.java:94)
at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l$11.run(AuthoringTool.java:681)
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.pumpOneEventForHierar chy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.Dialog.show(Unknown Source)
at edu.cmu.cs.stage3.swing.DialogManager.showModalDia log(DialogManager.java:58)
at edu.cmu.cs.stage3.swing.DialogManager.showDialog(D ialogManager.java:123)
at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.play(AuthoringTool.java:5073)
at edu.cmu.cs.stage3.alice.authoringtool.Actions$15.a ctionPerformed(Actions.java:167)
at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)
at javax.swing.AbstractButton$ForwardActionEvents.act ionPerformed(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 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.pumpOneEventForHierar chy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)