Hashcat returning CL_INVALID_KERNEL_ARGS

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Attempting to crack my wifi pw (dictionary includes my own, it's more to learn the tool), however I'm getting the above error when I try to run it.  Full error is clEnqeueNDRangeKernel(): CL_INVALID_KERNEL_ARGS  Seems relatively straightforward, the kernel arguments are incorrect, however I'm unsure of how to correct them.