C#:
NAPI.ClientEvent.TriggerClientEvent(player, "errorShow", "Some err!");
JavaScript:
mp.events.add('errorShow', (error) =>
{
let error1 = toString(error)
loginWindow.execute(`errorShow(${error1})`)
})
JavaScript:
const errorShow = (error) => {
document.getElementById("alertText").innerHTML = `${error}`
}