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I was faced with same error. So, I checked official document. There is the following explanation in this document.
Many kernels use 256 as its workgroup size if possible, so the max work group size of the device must larger than 256. All GPU devices we are aware of indeed support 256 workitems in a workgroup, however non GPU devices may not. This will be improved in the future.
So, your hardware(CPU or GPU) may not meet this requirements. I recommend that you check your hardware spec.
