knowrob json_prolog problems

edit

Thanks a lot for your quick response. Yes, all the errors are gone now with the svn version.

Ze

Following the above question, it seems the problem comes from swi-prolog...

As the error is from /usr/lib/swi-prolog/library/process.pl, I changed it a bit as:

:- module(process,
  [ process_create/3,       % +Exe, +Args, +Options
    process_wait/2,     % +PID, -Status
    process_id/1,       % -PID
    process_id/2,       % +Process, -PID
    is_process/1,       % +PID
    process_release/1,      % +PID
    process_kill/1      % +PID
  ]).
:- use_module(library(shlib)).
:- use_module(library(lists)).
:- use_module(library(option)).
:- use_module(library(process)).
%:- use_foreign_library(foreign(process)).

Some functions are removed from the process list: process_create/2, process_kill/2, etc. Also, use_foreign_library(foreign(process)) caused other errors, so I also commented it out. I am not sure if this makes sense.

But I can get rid of some of the errors. But certainly this is not the ideal way, as other programs also require some missing functions, such as process_create/2, which I removed from the list. I guess this is somehow the problem of the ubuntu version of the swi-prolog, where the process.pl is incompatible.. But as I am not familiar with Prolog, could anyone help?

Many thanks.