Newbie problem: invalid context for definition

When I try this little program, using sisc-1.16.6, ...

(define desc-series
	(lambda (size)
		(let countdown ((n size) (s ()))
			(if (= n 0) s
				(countdown (- n 1) (append s (list n)))))))

(define do-from-to
	(lambda (m n)
		(let loop ((i m))
			(begin
				(define i2 (* i i)) (display i2) (newline)
				(define ds (desc-series i2)) (display ds) (newline) ;problem
				(if (= i n) 'done
					(loop (+ i 1)))))))

(do-from-to 2 4)

... I get this:

Error in load: evaluation error at file: ...
...
Caused by Error: invalid context for definition (define ds (desc-series i2))

If I comment out the entire "problem" line, then I get no error. Why is
"(define i2 (* i i))" OK and "(define ds (desc-series i2))" not?

When I tried a slightly simplified version in the sisc-online.php, I got
this:

Error in =: expected type number, got '#!void'.

Sincerey,

Jon


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