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

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java.lang.NullPointerException:
at com.jme3.shader.Uniform.setValue(Uniform.java:185)
at com.jme3.material.Technique.updateUniformParam(Technique.java:149)
at com.jme3.material.MatParam.apply(MatParam.java:133)
at com.jme3.material.Material.preload(Material.java:1059)
at com.jme3.renderer.RenderManager.preloadScene(RenderManager.java:613)
at com.jme3.renderer.RenderManager.preloadScene(RenderManager.java:604)
at com.jme3.animation.SkeletonControl.testHardwareSupported(SkeletonControl.java:162)
at com.jme3.animation.SkeletonControl.controlRender(SkeletonControl.java:276)
at com.jme3.scene.control.AbstractControl.render(AbstractControl.java:119)
at com.jme3.scene.Spatial.runControlRender(Spatial.java:681)
at com.jme3.renderer.RenderManager.renderSubScene(RenderManager.java:667)
at com.jme3.renderer.RenderManager.renderSubScene(RenderManager.java:677)
at com.jme3.renderer.RenderManager.renderSubScene(RenderManager.java:677)
at com.jme3.renderer.RenderManager.renderSubScene(RenderManager.java:677)
at com.jme3.renderer.RenderManager.renderSubScene(RenderManager.java:677)
at com.jme3.renderer.RenderManager.renderScene(RenderManager.java:656)
at com.jme3.renderer.RenderManager.renderViewPort(RenderManager.java:1029)
at com.jme3.renderer.RenderManager.render(RenderManager.java:1088)
at com.jme3.app.SimpleApplication.update(SimpleApplication.java:260)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:192)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:232)
at java.lang.Thread.run(Thread.java:745)

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