Uri_services problem

Hi
I am trying to use ocaml-uri lib functions
(Uri_services.service_of_tcp_port and Uri_services.service_of_udp_port).

However, I get this error:
File "_none_", line 1:
Error: No implementations provided for the following modules:
         Uri_services referenced from src/uri_services_problem.cmx
Command exited with code 2.

However, the Uri_services.cmx file is indeed located in
my .opam/4.02.0dev+fp/lib/uri directory.
Plus, I am using using the Uri_IP module without any problem.
I have no idea how to fix this.
The attached file is a small program that cause this error.

Thanks in advance for your time.
Regards.
Johan


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