Javascript error number 8 : syntax error using Pagestaker script

In case anyone else is having this problem, I have regressed to InDesign v 17 / 2022 and the script works there as before. Apparently not compatible with the latest version of InDesign.

Adobe team, PLEASE integrate page numbering for epub export directly into InDesign so we don't have to rely on third-party scripts which may or may not be compatible with updates.

It will be very hard to investigate as PageStakerLib.jsxbin is a JSXBIN...

I added some alerts to see where it's failing 

app.insertLabel('com.rorohiko.activescriptpath', '');
var scriptFile;
if ($.fileName && $.fileName != "") {
    scriptFile = new File($.fileName);
}

if (!scriptFile || !scriptFile.exists) {
    if (app.activeScript instanceof File) {
        scriptFile = app.activeScript;
    }
}

if (scriptFile) {
    var libPath = new File(scriptFile.parent + "/PageStakerLib.jsxbin");
    if (!libPath.exists) {
        libPath = new File(scriptFile.parent + "/PageStakerLib.jsx");
    }

    if (libPath.exists) {
        try {
            app.doScript(libPath, ScriptLanguage.JAVASCRIPT);
            PageStakerLib.processCurDoc();
        } catch (e) {
            alert("Error executing script: " + e.message);
        }
    } else {
        alert("Library file does not exist: " + libPath.fsName);
    }
} else {
    alert("Script file is not defined or does not exist.");
}