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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)