在尝试使用PHP和JQuery处理Mailchimp API时，得到一个500的错误代码

我一直在尝试使用Mailchimp API将联系人添加到Mailchimp列表中。我使用JQuery处理表单，并使用PHP脚本与Mailchimp API通信。但我是遵循的例子:https://github.com/drewm/mailchimp-api/blob/master/README.md

<form name="SubsribeForm1" id="SubsribeForm1">
  <input name="email" id="emailAdd" type="text" />
  <p class="err"><span id="msg"></span></p>
  <button id="SubscribeEmail">Submit</button>
</form>

JS代码:

<script>
    $('#reset-modal').click(function() {
        $('#msg').html("");
    });
    $(document).on("click", "#SubscribeEmail", function(e){
        e.preventDefault();
        var emailAdd = $('input[name="email"]').val();
        console.log(emailAdd);
        $.ajax({
            url: "subscribe.php",
            data: $('#SubsribeForm1').serialize(),
            dataType: "json",
            timeout: 15000,
            success: function(response){
                switch(response.status){
                    case 'saved':
                        $('#msg').html(response.message);
                    break;
                    case 'empty':
                        $('#msg').html(response.message);
                    break;
                    default:
                        $('#msg').html(response.message);
                }
             },
             error: function(response){
                $('#msg').html(response.status);
             }
        });
    });
    </script>

和subscribe.php:

require("_mc.php");
use 'DrewM'MailChimp'MailChimp;
$MailChimp = new MailChimp('7d446f0db3c6f9e4b5f9b6f35a587fad-us10');
$result = $MailChimp->post('lists/02801ed82a/members', array(
  'email_address'     => $_POST["email"],
  'status'            => 'subscribed'
));
if($result){
    $status = $result["status"];
    if($status == "subscribed"){
        echo "Great! We will keep you updated on our progress.";
    }
    else{
        echo "Oops! Something went wrong. Please try again.";
    }
}

我一直得到一个500错误，无法识别这里的问题。

Apache错误日志:

[Wed Oct 26 16:09:13.836172 2016] [:error] [pid 11669] [client 185.11.237.250:58101] PHP Fatal error:  Uncaught exception 'Exception' with message 'cURL support is required, but can't be found.' in /var/www/html/_mc.php:110'nStack trace:'n#0 /var/www/html/_mc.php(48): DrewM''MailChimp''MailChimp->makeRequest('post', 'lists/02801ed82...', Array, 10)'n#1 /var/www/html/subscribe.php(11): DrewM''MailChimp''MailChimp->post('lists/02801ed82...', Array)'n#2 {main}'n  thrown in /var/www/html/_mc.php on line 110, referer: http://meanwise.com/
[Wed Oct 26 16:09:17.195803 2016] [:error] [pid 11667] [client 185.11.237.250:58100] PHP Notice:  Undefined index: email in /var/www/html/subscribe.php on line 9, referer: http://meanwise.com/
[Wed Oct 26 16:09:17.195942 2016] [:error] [pid 11667] [client 185.11.237.250:58100] PHP Fatal error:  Uncaught exception 'Exception' with message 'cURL support is required, but can't be found.' in /var/www/html/_mc.php:110'nStack trace:'n#0 /var/www/html/_mc.php(48): DrewM''MailChimp''MailChimp->makeRequest('post', 'lists/02801ed82...', Array, 10)'n#1 /var/www/html/subscribe.php(11): DrewM''MailChimp''MailChimp->post('lists/02801ed82...', Array)'n#2 {main}'n  thrown in /var/www/html/_mc.php on line 110, referer: http://meanwise.com/
[Wed Oct 26 16:09:31.813947 2016] [:error] [pid 11668] [client 185.11.237.250:58136] PHP Notice:  Undefined index: email in /var/www/html/subscribe.php on line 9
[Wed Oct 26 16:09:31.814129 2016] [:error] [pid 11668] [client 185.11.237.250:58136] PHP Fatal error:  Uncaught exception 'Exception' with message 'cURL support is required, but can't be found.' in /var/www/html/_mc.php:110'nStack trace:'n#0 /var/www/html/_mc.php(48): DrewM''MailChimp''MailChimp->makeRequest('post', 'lists/02801ed82...', Array, 10)'n#1 /var/www/html/subscribe.php(11): DrewM''MailChimp''MailChimp->post('lists/02801ed82...', Array)'n#2 {main}'n  thrown in /var/www/html/_mc.php on line 110
[Wed Oct 26 16:09:36.833363 2016] [:error] [pid 31170] [client 185.11.237.250:58140] PHP Notice:  Undefined index: email in /var/www/html/subscribe.php on line 9
[Wed Oct 26 16:09:36.833503 2016] [:error] [pid 31170] [client 185.11.237.250:58140] PHP Fatal error:  Uncaught exception 'Exception' with message 'cURL support is required, but can't be found.' in /var/www/html/_mc.php:110'nStack trace:'n#0 /var/www/html/_mc.php(48): DrewM''MailChimp''MailChimp->makeRequest('post', 'lists/02801ed82...', Array, 10)'n#1 /var/www/html/subscribe.php(11): DrewM''MailChimp''MailChimp->post('lists/02801ed82...', Array)'n#2 {main}'n  thrown in /var/www/html/_mc.php on line 110

修复curl问题后，我得到以下错误(我不是PHP专业人士):

[Thu Oct 27 11:00:54.503907 2016] [:error] [pid 16992] [client 85.53.86.120:64765] PHP Notice:  Undefined index: email in /var/www/html/subscribe.php on line 9, referer: http://meanwise.com/