Verifying reCAPTCHA solutions

I have tested Recaptcha and set PHP code. It is working recaptcha but still a message inside system like We detected that your site is not verifying reCAPTCHA solutions.
How is this possible as $_POST[“g-recaptcha-response”] is submitted and reCaptcha works as validation. I have tried to add code recaptchalib.php at URL:
https://github.com/tutsplus/how-to-integrate-google-no-captcha-recaptcha-on-your-website/blob/master/recaptchalib.php but have this message even Chrome does not report an error message.

Please find the whole code:

include('recaptchalib.php');
$response = null;
$reCaptcha = new ReCaptcha($secret);
if ($_POST["g-recaptcha-response"]) {
    $response = $reCaptcha->verifyResponse(
        $_SERVER["REMOTE_ADDR"],
        $_POST["g-recaptcha-response"]
    );
}

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