How to edit Color Notes plugin in MS 4.x

To your plugins folder. Be sure to change the title so you can tell it apart from the pre-installed version.

made a copy of the original color notes qml_disabled file that was in the plugins folder

I guess that name is self-explanatory, isn't it?

Here is my simple code, but it does not load.

//=============================================================================
// MuseScore
// Music Composition & Notation
//
// Changes by: Wlodzislaw Duch
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2
// as published by the Free Software Foundation and appearing in the file LICENCE.GPL
//=============================================================================

import QtQuick 2.9
import MuseScore 4.0

MuseScore {
version: "4.0"
description: qsTr("This plugin colors sharp notes red and flat notes blue")
menuPath: "Plugins"

Component.onCompleted: {
    if (mscoreMajorVersion >= 4) {
        title = qsTr("Notes.Color SharpFlat");
        category = "color-notes";
    }
}

// Function to color notes based on accidental
function colorNoteByAccidental(note) {
    // Default all notes to black
    note.color = "#000000";

    // Check if the note has an accidental
    if (note.accidental) {
        // Check if the accidental is a sharp
        if (note.accidental.symbol === "sharp") {
            note.color = "#FF0000"; // Red color for sharps
            note.accidental.color = "#FF0000"; // Red color for sharp accidental
        }
        // Check if the accidental is a flat
        else if (note.accidental.symbol === "flat") {
            note.color = "#0000FF"; // Blue color for flats
            note.accidental.color = "#0000FF"; // Blue color for flat accidental
        } else {
            note.accidental.color = "#000000"; // Set accidental color to black if neither sharp nor flat
        }
    }
}

// Apply the colorNoteByAccidental function to all notes in the selection or entire score
function applyToAllNotes(func) {
    var cursor = curScore.newCursor();
    cursor.rewind(0); // Start at the beginning of the score

    while (cursor.segment) {
        if (cursor.element && cursor.element.type === Element.CHORD) {
            var notes = cursor.element.notes;
            for (var k = 0; k < notes.length; k++) {
                var note = notes[k];
                func(note);
            }
        }
        cursor.next();
    }
}

// Entry point when the plugin is run
onRun: {
    console.log("Running Color Notes by Accidental");

    if (typeof curScore === 'undefined') {
        (typeof(quit) === 'undefined' ? Qt.quit : quit)();
    }

    applyToAllNotes(colorNoteByAccidental);

    (typeof(quit) === 'undefined' ? Qt.quit : quit)();
}

}