include images in the page

I have  SWI-Prolog (Multi-threaded, 64 bits, Version 6.6.4)

Wrote test program 
:- use_module(library(http/thread_httpd)).
:- use_module(library(http/http_dispatch)).
:- use_module(library(http/http_error)).
:- use_module(library(http/html_write)).
:- use_module(library(http/http_path)).
:- use_module(library(http/http_files)).


:- multifile http:location/3.
:- dynamic   http:location/3.
:- multifile user:file_search_path/2.
:- dynamic 	user:file_search_path/2.




http:location(images,	'images', []).

user:file_search_path(icons,		'/Users/joseffrydl/Desktop/proKatu/praveTed/icons').

:- http_handler(images(.), serve_files_in_directory(icons), [prefix]).




port(8881).
start :-
    port(Port),server(Port).


stop :-
    port(Port),
    http_stop_server(Port, []).


server(Port) :-
        http_server(http_dispatch, [port(Port)]).
invoke  it with
http://localhost:8881/images/empilotmainlogo.png
and got

Not Found

The requested URL /images/empilotmainlogo.png was not found on this server



Can you please tekk me what I do wrong?

I think I folow  Serving plain files from the SWI-Prolog HTTPD
with no success.

Thanks Josef Frydl


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