Class 'Zizaco\Confide\UserValidator' not found

[blueskysd]

I'm using the following as UserValidator.php, but I get the error

Class 'Zizaco\Confide\UserValidator' not found

<?php

use Zizaco\Confide\UserValidator as ConfideUserValidator;
use Zizaco\Confide\UserValidatorInterface;

class UserValidator extends ConfideUserValidator implements UserValidatorInterface
{
    public $rules = [
        'create' => [
            'username' => 'required',
            'email'    => 'required|email',
            'password' => 'required|min:4',
            'firstname' => 'required|alpha',
            'lastname' => 'required|alpha',
        ],
        'update' => [
            'username' => 'required',
            'email'    => 'required|email',
            'password' => 'required|min:4'
            'firstname' => 'required|alpha',
            'lastname' => 'required|alpha',,
        ]
    ];
}

Have I missed something?

Thanks!