java.lang.NullPointerException: This exception has no message.

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Problem with Picking in Opengl

This exception has no message.

java.lang.NullPointerException: 	at msi.gama.metamodel.agent.AgentIdentifier.getAgent(AgentIdentifier.java:56)	at ummisco.gama.opengl.SWTOpenGLDisplaySurface.selectAgent(SWTOpenGLDisplaySurface.java:581)	at ummisco.gama.opengl.scene.AbstractObject.draw(AbstractObject.java:156)	at ummisco.gama.opengl.scene.LayerObject.drawPicking(LayerObject.java:213)	at ummisco.gama.opengl.scene.LayerObject.drawWithoutShader(LayerObject.java:155)	at ummisco.gama.opengl.scene.LayerObject.draw(LayerObject.java:98)	at ummisco.gama.opengl.scene.ModelScene.draw(ModelScene.java:168)	at ummisco.gama.opengl.JOGLRenderer.drawScene(JOGLRenderer.java:330)	at ummisco.gama.opengl.JOGLRenderer.display(JOGLRenderer.java:233)	at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:692)	at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:677)	at com.jogamp.opengl.swt.GLCanvas$2.run(GLCanvas.java:159)	at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1293)	at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1147)	at com.jogamp.opengl.swt.GLCanvas$3.run(GLCanvas.java:171)	at com.jogamp.opengl.swt.GLCanvas.runInGLThread(GLCanvas.java:959)	at com.jogamp.opengl.swt.GLCanvas.display(GLCanvas.java:658)	at jogamp.opengl.GLDrawableHelper.invoke(GLDrawableHelper.java:912)	at com.jogamp.opengl.swt.GLCanvas.invoke(GLCanvas.java:789)	at ummisco.gama.opengl.camera.AbstractCamera.mouseDown(AbstractCamera.java:278)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:192)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1299)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4072)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3698)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:694)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)	at msi.gama.application.Application.start(Application.java:43)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)	at org.eclipse.equinox.launcher.Main.run(Main.java:1515)	at org.eclipse.equinox.launcher.Main.main(Main.java:1488)