lisp - Invalid specialized parameter in method lambda list -


i trying write simple coin flip program in common lisp. code have 

(defun yn  (let ht (random 1)   (if (eq ht 1)    (princ heads)    (princ tails))  ) )

it seems simple enough, keep getting error:

"invalid specialized parameter in method lambda list (let ht (random 1) (if (eq ht 1) (princ heads) (princ tails))): (if (eq ht 1) (princ heads) (princ tails))"       )

what wrong here?

for defun without parameters, there should empty parameter list, following:

(defun yn ()   (let ((ht (random 2)))     (if (eq ht 1)         (princ heads)         (princ tails))))

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