Requesting help with Zizaco/Confide integration due to error

[kz]

Hi there. I've come here to seek a potential solution to an issue I have. I am running Laravel 4 with the packages: https://github.com/Zizaco/confide and https://github.com/greggilbert/recaptcha

All the code was fine up to when I added the reCAPTCHA package. When I did, I received this error: http://prntscr.com/478hzd

Here's how I added the package.

1. Under /vendor/zizaco/confide/src/Zizaco/Confide/ConfideUser.php:

    public static $rules = array(
        'username' => 'required|alpha_dash|unique:users',
        'email' => 'required|email|unique:users',
        'password' => 'required|min:4|confirmed',
        'password_confirmation' => 'min:4',
        'recaptcha_response_field' => 'required|recaptcha', // I added this line.
    );

1. Under /vendor/zizaco/confide/src/views/signup.php:

        <div class="form-group">
            {{ Form::captcha() }}
        </div>

I can confirm that the public and private keys are correct. Everything has been configured fine. Perhaps it may be that this is being coded incorrectly? Please let me know if you have any ideas. Many thanks.