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java.lang.IllegalArgumentException: string == null	at android.opengl.GLES20.glShaderSource(Native Method)	at org.rajawali3d.materials.Material.loadShader(Material.java:732)	at org.rajawali3d.materials.Material.createProgram(Material.java:757)	at org.rajawali3d.materials.Material.createShaders(Material.java:680)	at org.rajawali3d.materials.Material.reload(Material.java:488)	at org.rajawali3d.materials.MaterialManager.taskReload(MaterialManager.java:72)	at org.rajawali3d.renderer.RajawaliRenderer.onRenderSurfaceSizeChanged(RajawaliRenderer.java:363)