Error Syntax

SEVERE: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
java.lang.NullPointerException
    at mygame.Main.simpleUpdate(Main.java:97)
    at com.jme3.app.SimpleApplication.update(SimpleApplication.java:241)
    at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
    at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:185)
    at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:228)
    at java.lang.Thread.run(Thread.java:722)

Jun 13, 2013 4:13:09 PM com.jme3.renderer.lwjgl.LwjglRenderer cleanup
INFO: Deleting objects and invalidating state
Jun 13, 2013 4:13:09 PM com.jme3.scene.Node detachChildAt
INFO: Gui Node (Node): Child removed.
Jun 13, 2013 4:13:09 PM com.jme3.scene.Node detachChildAt
INFO: Gui Node (Node): Child removed.
Jun 13, 2013 4:13:09 PM com.jme3.input.lwjgl.LwjglMouseInput destroy
INFO: Mouse destroyed.
Jun 13, 2013 4:13:09 PM com.jme3.input.lwjgl.LwjglKeyInput destroy
INFO: Keyboard destroyed.
Jun 13, 2013 4:13:09 PM com.jme3.system.lwjgl.LwjglAbstractDisplay deinitInThread
INFO: Display destroyed.
BUILD SUCCESSFUL (total time: 7 seconds)