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java.lang.IllegalArgumentException: string == null	at android.opengl.GLES20.glShaderSource(Native Method)	at org.rajawali3d.materials.Material.loadShader(Material.java:731)	at org.rajawali3d.materials.Material.createProgram(Material.java:756)	at org.rajawali3d.materials.Material.createShaders(Material.java:679)	at org.rajawali3d.materials.Material.useProgram(Material.java:789)	at org.rajawali3d.Object3D.render(Object3D.java:253)	at org.rajawali3d.Object3D.render(Object3D.java:318)	at org.rajawali3d.Object3D.render(Object3D.java:318)	at org.rajawali3d.Object3D.render(Object3D.java:181)	at org.rajawali3d.scene.RajawaliScene.render(RajawaliScene.java:1109)	at org.rajawali3d.scene.RajawaliScene.render(RajawaliScene.java:971)	at org.rajawali3d.renderer.Renderer.render(Renderer.java:421)	at org.rajawali3d.renderer.Renderer.onRender(Renderer.java:411)	at org.rajawali3d.renderer.Renderer.onRenderFrame(Renderer.java:386)	at org.rajawali3d.view.TextureView$GLThread.guardedRun(TextureView.java:1277)	at org.rajawali3d.view.TextureView$GLThread.run(TextureView.java:997)