Bad argument when open_port with spawn_executable

Hello,
according to documentation I'm trying use spawn_executable argument to
open_port/2. It seems there is a bug or I missed something?

13> open_port({spawn_executable, os:find_executable("perl")}, []).
** exception error: bad argument
     in function  open_port/2
        called as open_port({spawn_executable,"/usr/bin/perl"},[])

I obtain same result for wide variety of PortSettings which seems not
affecting it.

Best regards

--
--Hynek (Pichi) Vychodil

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