“Invalid parameter number: parameter was not defined” Inserting data

UPDATE

I was making a petty mistake when listing the VALUES. I should have put ":username" and not ":alias". I suppose the answer credit to this question is free reign for anyone who wants it? Or do I delete the question?

ORIGINAL

I've been using Yii's active record pattern for a while. Now, my project needs to access a different database for one small transaction. I thought the Yii's DAO would be good for this. However, I'm getting a cryptic error.

CDbCommand failed to execute the SQL statement: SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

Here is my code:

public function actionConfirmation
{
    $model_person = new TempPerson();

    $model = $model_person->find('alias=:alias',array(':alias'=>$_GET['alias']));
    $connection=Yii::app()->db2;
            $sql = "INSERT INTO users (username, password, ssn, surname
                    , firstname, email, city, country) 
                    VALUES(:alias, :password, :ssn, :surname
                    , :firstname, :email, :city, :country)";
            $command=$connection->createCommand($sql);
            $command->bindValue(":username", $model->alias);
            $command->bindValue(":password", substr($model->ssn, -4,4));
            $command->bindValue(":ssn", $model->ssn);
            $command->bindValue(":surname", $model->lastName);
            $command->bindValue(":firstname", $model->firstName);
            $command->bindValue(":email", $model->email);
            $command->bindValue(":city", $model->placeOfBirth);
            $command->bindValue(":country", $model->placeOfBirth);
            $command->execute();
            $this->render('confirmation',array('model'=>$model));
}

This constructs the following query (as seen on the application log):

INSERT INTO users (username, password, ssn, surname, firstname, email
                   , city, country) 
VALUES(:alias, :password, :ssn, :surname, :firstname, :email, :city, :country);

FYI $model->placeOfBirth is supposed to be in both city and county values. That's not a typo (just a silly thing I have to do).