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simple postprocess


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Hi there I try to do simple postprocess on scene and I have back this error:

Uncaught TypeError: Failed to execute 'uniform1fv' on 'WebGLRenderingContext': No function was found that matched the signature provided.


      var sepiaKernelMatrix = BABYLON.Matrix.FromValues(
                        0.393, 0.349, 0.272, 0,
                        0.769, 0.686, 0.534, 0,
                        0.189, 0.168, 0.131, 0,
                        0, 0, 0, 0
      var postProcess = new BABYLON.ConvolutionPostProcess("Sepia", sepiaKernelMatrix, 1.0, camera, null, engine, true);
What I doing wrong !?
before was working fine, is there another change in 2.1 ?
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