In 5.5 in the RoughnessIntegrator module all SampleRenderTargetValue function calls have to have one extra parameter. So instead of:
RT_PixelAttribsA_CascX.SampleRenderTargetValue(float2(CascPosX[0],CascPosY[0]), SampleValues[0]);
It should be:
RT_PixelAttribsA_CascX.SampleRenderTargetValue(float2(CascPosX[0],CascPosY[0]), 0.0f, SampleValues[0]);