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recursive count down

I am trying to write a function that performs a count-down operation.  I have
coded the following using standard textbook material:

(defun Count-down (number)
      (cond ((= number 0) nil)
            (t (print number) (Count-down (- num 1)))))

Running the above with **(Count-down 4)** results in **0 is not a sequence**

If anyone knows what is wrong with the code please let me know.
I can be reached also at jamila@jamila.gsfc.nasa.gov