Using Google reCaptcha always shows 'incorrect-captcha-sol'
问题 I'm trying to use Google reCaptcha on my website and after following several tutorials, I'm using as follow on my HTML page: <section class="row" id="Contact"> <div class="col-full"> <form method="post" action="contact.php"> <input name="sender" placeholder="Name" size="30"><br><br> <input name="senderEmail" placeholder="Email" size="30"><br><br> <textarea rows="10" cols="30" name="message" placeholder="Message"></textarea><br><br> <div class="g-recaptcha" data-sitekey=