Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at sim.util.SimpleProperties.numProperties(SimpleProperties.java:642)
at sim.portrayal.SimpleInspector.generateProperties(SimpleInspector.java:195)
at sim.portrayal.SimpleInspector.<init>(SimpleInspector.java:62)
at sim.portrayal.SimpleInspector.<init>(SimpleInspector.java:93)
at sim.portrayal.SimpleInspector.<init>(SimpleInspector.java:85)
at sim.portrayal.Inspector.getInspector(Inspector.java:98)
at sim.portrayal.SimplePortrayal2D.getInspector(SimplePortrayal2D.java:79)
at sim.portrayal.FieldPortrayal.getInspector(FieldPortrayal.java:298)
at sim.display.Display2D.createInspectors(Display2D.java:1744)
at sim.display.Display2D.createInspectors(Display2D.java:1767)
at sim.display.Display2D$8.mouseClicked(Display2D.java:1392)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:269)
at java.awt.Component.processMouseEvent(Component.java:6536)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4534)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)