How to create working KillSults ?

var target;
var EntityPlayer = Java.type('net.minecraft.entity.player.EntityPlayer');
var RedeskyWords = [
    "/tell %name% What client? To respond do /r (message)",
    "Config issue %name%",
    "Vai foder te para o caralho %name%",
    "Increve-se ao 'Coccocoa's Helper' no youtube",
    "Vai te foder %name%",
    "O anticheat melhor, AAC",
    "Vips fodem penis.",
    "Servidor lixo, vai foder vc mesmo.",
    "Don't use j75's config. Use mine! Sub me on yt, Coccocoa's Helper.",
    "Win every HvH with my new config! Get on my channel, Coccocoa's Helper.",
    "Você tem de pegar um hack, eu recommendo o liquidbounce.net",
    "Servidor de lx cheio de vips.",
    "Você é um resto de aborto %name%"
]
var script = registerScript({
	name: "KillSults",
	version: "1.0",
	authors: ["Gabriel"]
});
script.registerModule({
	name: "KillSults",
	description: "Insults people when you kill them.",
    category: "Misc",
	settings: {
		Mode: Setting.list({
			name: "Mode",
			default: "Redesky",
			values: ["L", "Redesky"]
		}),
	}
}, function (module) {
	module.on("enable", function () {
		target = null;
    })
	module.on("attack", function (event) {
		if (event.getTargetEntity() instanceof EntityPlayer) {
			target = event.getTargetEntity();
		}
    })
	module.on("update", function () {
        module.tag = module.settings.Mode.get();
        if (target != null) {
            if (target.isDead) {
                switch (module.settings.Mode.get()) {
                    case "L":
                        mc.thePlayer.sendChatMessage("L " + target.getName());
                        break;
                    case "Redesky":
                        mc.thePlayer.sendChatMessage(RedeskyWords[parseInt(Math.random() * RedeskyWords.length)].replace(/%name%/, target.getName()));
                        break;
                }
                target = null;
            }
        }
    })
})