Button.onClick does not work when I renamed

no, it does not work, look thats scripts by Carlos

   ////// LINE  54
win.g100.bu2 = win.g100.add('button',undefined,'Cancel'); /////////////////////////////////////////  Please, try to rename "cancel" to "Cancelar" 

to "cancel"

works perfect with "cancel", but rename to "cancelar", click does works :S

Run first with "cancel", second close that script, third, renown "Cancelar" and run script, click does not work , I've tried on another computer :S

#target illustrator

main();
function main(){
    if(!documents.length) return;
    //var allLayers = app.activeDocument.layers;
    var win = new Window( 'dialog', '' );
    g = win.graphics;
    //  var myBrush = g.newBrush(g.BrushType.SOLID_COLOR, [0.99, 0.99, 0.99, 1]); // CS5
    var myBrush = g.newBrush(g.BrushType.SOLID_COLOR, [0.50, 0.50, 0.50, 1]); // CS6
    g.backgroundColor = myBrush;
    win.orientation='stack';
    win.p1= win.add("panel", undefined, undefined, {borderStyle:"black"});
    win.g1 = win.p1.add('group');
    win.g1.orientation = "row";
    win.title = win.g1.add('statictext',undefined,'Rename Visible Layers or Sublayers');
    win.title.alignment="fill";
    var g = win.title.graphics;
    g.font = ScriptUI.newFont("Georgia","BOLDITALIC",22);
    win.g5 =win.p1.add('group');
    win.g5.orientation = "column";
    win.g5.alignChildren='left';
    win.g5.spacing=10;
    win.g5.st1 = win.g5.add('statictext',undefined,'New layer name');
    win.g5.et1 = win.g5.add('edittext');
    win.g5.et1.preferredSize=[250,20];
    win.g10 =win.p1.add('group');
    win.g10.orientation = "row";
    win.g10.alignment='fill';
    win.g10.spacing=10;
    win.g10.st1 = win.g10.add('statictext',undefined,'Serial Number');
    win.g10.et1 = win.g10.add('edittext',undefined,'1');
    win.g10.et1.preferredSize=[50,20];
    win.g10.et1.onChanging = function() {
      if (this.text.match(/[^\-\.\d]/)) {
        this.text = this.text.replace(/[^\-\.\d]/g, '');
      }
    };
    win.g10.st1 = win.g10.add('statictext',undefined,'Length');
    var nums=[2,3,4,5];
    win.g10.dl1 = win.g10.add('dropdownlist',undefined,nums);
    win.g10.dl1.selection=0;
    win.g15 =win.p1.add('group');
    win.g15.orientation = "row";
    win.g15.alignment='fill';
    win.g15.cb1 = win.g15.add('checkbox',undefined,'Reverse layer order');
    win.g15.cb2 = win.g15.add('checkbox',undefined,'Rename Sublayers Only');
    win.g100 =win.p1.add('group');
    win.g100.orientation = "row";
    win.g100.alignment='center';
    win.g100.spacing=10;
    win.g100.bu1 = win.g100.add('button',undefined,'Rename');
    win.g100.bu1.preferredSize=[120,30];
    win.g100.bu2 = win.g100.add('button',undefined,'Cancel'); /////////////////////////////////////////  Please, try to rename "cancel" to "cancel"
    win.g100.bu2.preferredSize=[120,30];
    win.g100.bu1.onClick=function(){
        if(win.g5.et1.text == ''){
            alert("No layer name has been entered!");
            return;
        }
        win.close(0);
     
        var sublayersOnly = win.g15.cb2.value;
        var visibleLayers = [];
        getVisibleLayers (app.activeDocument, visibleLayers, sublayersOnly);


        if(win.g15.cb1.value) visibleLayers.reverse();

        for(b=0; b<visibleLayers.length; b++){
            var LayerName = win.g5.et1.text + zeroPad((Number(win.g10.et1.text)+Number(b)), Number(win.g10.dl1.selection.text));
            visibleLayers.name = LayerName;

        }
    }
    win.center();
    win.show();


    function getVisibleLayers(container, visibleLayers, sublayersOnly) {


        for(var a=0; a<container.layers.length; a++){
            var ilayer = container.layers;

            if (ilayer.visible) {
                if (sublayersOnly) {
                    getVisibleLayers (ilayer, visibleLayers, false); // false to process only 1 sublayer depth
                }
                else
                visibleLayers.push(ilayer);
            }
        }


    }


}




function zeroPad(n, s) {
    n = n.toString();
    while (n.length < s) n = '0' + n;
    return n;
};