Fatal error: Class 'ReCaptcha\RequestMethod\Post' not found

I've downloaded v2 and I'm getting this error when trying to validate the response.I'm running this locally but have also received the same error on the real server.My code is pretty much copy/paste from google if (!empty($human)) { require_once('Captcha/ReCaptcha.php'); $recaptcha = new \ReCaptcha\ReCaptcha($secret); $resp = $recaptcha->verify($human, $remoteIp); if ($resp->isSuccess()) { // verified! } else {}else{} -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.