Hi Jaime!

I've rerun my codes but I don't seem to get the error you've experienced. I guess you can first try to rerun the code from the linked GitHub repository, to ensure that the codes are complete. I'm using Python version 3.8.5 to run these codes.

Also, from what I know, the "no matching signature found" error is due to data type mismatch. Check if the "chico" variable is indeed a numpy.ndarray datatype. Each element of this numpy array should be a numpy.uint8 type.

Thanks!