[O] what's wrong with this sbe?

[Myles English]

Hi,

Please could tell me where I am going wrong with this?  I just can't get
the source block to put a result in the table.

#+name: workingDays
#+BEGIN_SRC emacs-lisp :var hms="0"
(require 'org-timer)
(/ (org-timer-hms-to-secs hms) (* 60 60 8))
#+END_SRC

#+call: workingDays(hms="236:30:00")

#+RESULTS: workingDays(hms="236:30:00")
: 29

| Days   |     H:M:S |
|--------+-----------|
| #ERROR | 236:30:00 |
#+TBLFM: @2$1='(sbe "workingDays" (hms @2$2))


Thanks,

Myles