[MissingUsernameError] No username was given

[adityad12]

**const User = mongoose.model('Users', UserSchema);

User.register({username:'username', active: false}, 'password', function(err, user) {
if (err) { ... }

const authenticate = User.authenticate();
authenticate('username', 'password', function(err, result) {
if (err) { ... }

// Value 'result' is set to false. The user could not be authenticated since the user is not active

});
});** This belongs to the README

After implementing this error is returned which tells the username was not given, even after giving an username as an input

[adityad12]

I am sorry if this is a silly issue and if it has a silly answer, I tried and searched for a long time and did not get any satisfactory answer.