loadColorSettings breaks script in newer version of illustrator (29+)

Hey, I just removed the non-essential stuff, the `$` from the start of the doc variable, and added `app` to the `loadColorSettings` method call and all works for me on Ai v30.5.1.

try {
    var doc = app.activeDocument;

    var colorSettingsFile = new File(
        Folder.userData + "/Adobe/Color/Settings/ISO Coated v2 (ECI)-sRGB.csf"
    );

    var bpc_Color_Settings = new File(
        Folder.userData + "/Adobe/Color/Settings/ISO Coated v2 (ECI)-sRGB_bpc.csf"
    );

    if (bpc_Color_Settings.exists) {
        colorSettingsFile = bpc_Color_Settings;
    }

    app.loadColorSettings(colorSettingsFile);

    for (var j = 0; j < doc.layers.length; j++) {
        $.writeln(doc.layers[j].name);
    }
} catch (e) {
    $.writeln(e);
}

For what it’s worth, I would probably wrap this entire thing in a custom function like below.

function loadBpcColorProfile() {
    if (!app.documents.length) {
        alert("No active document.");
        return;
    }

    var doc = app.activeDocument;

    var defaultColorSettings = new File(
        Folder.userData + "/Adobe/Color/Settings/ISO%20Coated%20v2%20(ECI)-sRGB.csf"
    );

    var bpcColorSettings = new File(
        Folder.userData + "/Adobe/Color/Settings/ISO%20Coated%20v2%20(ECI)-sRGB_bpc.csf"
    );

    var colorSettingsFile = bpcColorSettings.exists
        ? bpcColorSettings
        : defaultColorSettings;

    if (!colorSettingsFile.exists) {
        alert("Color settings file not found:\n" + colorSettingsFile.fsName);
        return;
    }

    app.loadColorSettings(colorSettingsFile);

    for (var i = 0; i < doc.layers.length; i++) {
        var layer = doc.layers[i];

        // Do something with each layer here
        $.writeln(layer.name);
    }
}

Try these out and let me know if they work for you? Cheers!