Make sure your application has been initialized before attempting to login.
App.Login's fields are (Username, Password, 2FA Code, CheckHWID, CheckIP);
If your account requires 2FA just include the code after the field password. Check HWID & Check IP both are just true or false if you set them both to true when the user logs in it will automatically compare & check their hwid & ip to the ones saved on our site and if they are different their app will close.