PEngines application not found?

Help!
1

UPDATE: I copied my entire Pengines setup from Windows to my Ubuntu 18.04 box. The problem does not happen with Linux. This appears to be a Windows-only thing. I really would like to get this solved on Windows because all my dev tools and the editor (Notepad++) I use along side the XPCE editor are on Windows.

I’m using: SWI-Prolog version 8.0.2. I have a PEngines app that I for some reason is not being recognized as a valid application when I try to call it. I am able to access the Genealogist app and run queries against it from a browser. But whenever I try to access my application, I get the error:

Error: pengine_application **tsll** does not exist

To create my application I cloned the Genealogist application directory. I then change the necessary files to support my application. Here are the pertinent details from their respective files:

FILE: pengines/run.pl

:- [load].

:- server(3030).

FILE: pengines/load.pl

% access at /apps/genealogist/index.html
:- if(exists_source(apps(genealogist/app))).
:- use_module(apps(genealogist/app)).
:- endif.

% access at /apps/tsll/index.html
:- if(exists_source(apps(tsll/app))).
:- use_module(apps(tsll/app)).
:- endif.

FILE: pengines/apps/tsll/app.pl

:- module(app_tsll, []).
:- use_module(library(pengines)).

:- pengine_application(tsll).
:- use_module(tsll:tsll).

FILE: index.html

  <script src="js/tsll.js"></script>

FILE: tsll.js

var pengine;

function ask() {
    var query = $("#query").val();
    if (query) {
        pengine = new Pengine({
            application: 'tsll',
            ask: query,
            onsuccess: function() {
                writeln(JSON.stringify(this.data));
                if (this.more) {
                    disableButtons(true, false, false, false);
                } else {
                    writeln("No more solutions");
                    disableButtons(false, true, true, true);                        
                }
            },
            onfailure: function() {
                writeln("Failure");
                disableButtons(false, true, true, true);
            },
            onstop: function() {
                writeln("Stopped");
                disableButtons(false, true, true, true);
            },
            onabort: function() {
                writeln("Aborted");
                disableButtons(false, true, true, true);
            },
            onerror: function() {
                writeln("Error: " + this.data);
                disableButtons(false, true, true, true);
            }
        });
    }
}

FILL: tsll.pl

:- module(
	% Module name.
		tsll,
	% Exported predicates list.
		[
			execute_single_user_action/2,
			execute_user_action_list/2,
			suggest_next_move_to/3,
			u_query/1
		]
	).

I know the app is being loaded because if I enter some junk into app.pl the interpreter complains about errors in that file. However, when I execute a query from the browser I get the error message above. I have stared at my files and the exact same files in the Genealogist app and I can’t see anything I’m doing differently, besides altering the necessary items to execute my app instead of the Genealogist app.

Can anyone see a problem in my code that would cause this? I am stumped at this point.

Also, is there some place in the Pengines code that I can place a spy point to try and trace out the issue? I tried tracing from the “front door”, but I’m hoping I don’t have to figure out how to wade through the Pengines multi-threaded HTTP server stuff “at the front” just to get to the point that the system actually tries to load the target app (tsll), to see if I can figure out what is really going wrong here.