We did change our postprocessing shader format already some times since 4.0, so just try to get a version similiar with the postprocessing shader, or update the shader yourself 
By the way: This error message has nothing to do with your GPU, it's just a broken shader. It *might* be a driver bug (common on mobiles), but on desktop GPUs, it's often a bug in the shader, so either dolphin, or the postprocessing one.
By the way: This error message has nothing to do with your GPU, it's just a broken shader. It *might* be a driver bug (common on mobiles), but on desktop GPUs, it's often a bug in the shader, so either dolphin, or the postprocessing one.