错误：表单提交失败，并且没有从以下位置返回错误消息：联系人.php

问：

我有这个问题

我的 php 代码是

<?php
//Import PHPMailer classes into the global namespace
//These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

if(isset($_POST['submit']))
{
    $name = $_POST["name"];
    $email = $_POST["email"];
    $subject = $_POST["subject"];
    $message = $_POST["message"];


//Load Composer's autoloader
require 'PHPMailer/Exception.php';
require 'PHPMailer/PHPMailer.php';
require 'PHPMailer/SMTP.php';

//Create an instance; passing `true` enables exceptions
$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->SMTPDebug = SMTP::DEBUG_SERVER;                      
    $mail->isSMTP();                                            
    $mail->Host       = 'smtp.gmail.com';                     
    $mail->SMTPAuth   = true;                                   
    $mail->Username   = '[email protected]';                     
    $mail->Password   = '000000000000';                               
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;            
    $mail->Port       = 587;                                    


    $mail->setFrom('[email protected]', 'Contactform');
    $mail->addAddress('[email protected]', 'website mail');  


    $mail->isHTML(true);                                  
    $mail->Subject = "Sender Subject - $subject";
    $mail->Body    = "Sender Name - $name <br> Sender Email - $email <br> Sender Subject - $subject <br> Message - $message";

    $mail->send();
    echo "Your message has been sent. Thank you!";
} catch (Exception $e) {
    echo "Message could not be sent.";
}

}

?>

我的 HTML 联系表单代码是

<div class="col-lg-8">
        <form action="contact.php" method="post" role="form" class="php-email-form">
          <div class="row">
            <div class="col-md-6 form-group">
              <input type="text" name="name" class="form-control" id="name" placeholder="Your Name" required>
            </div>
            <div class="col-md-6 form-group mt-3 mt-md-0">
              <input type="email" class="form-control" name="email" id="email" placeholder="Your Email" required>
            </div>
          </div>
          <div class="form-group mt-3">
            <input type="text" class="form-control" name="subject" id="subject" placeholder="Subject" required>
          </div>
          <div class="form-group mt-3">
            <textarea class="form-control" name="message" placeholder="Message" required></textarea>
          </div>
          <div class="my-3">
            <div class="loading">Loading</div>
            <div class="error-message">Message could not be sent.</div>
            <div class="sent-message">Your message has been sent. Thank you!</div>
          </div>
          <div class="text-center"><button type="submit" name="submit" value="submit">Send Message</button></div>
        </form>
      </div>

如果我从联系人中删除此代码，PHPMailer 和 contact.php 文件都可以正常工作.php

它连接了我的 html 联系表单和 php 文件以发送电子邮件，它可以正常工作，我的意思是它只将示例电子邮件发送到电子邮件 ID，但它正在工作。

当添加此代码将我的 HTML 联系人表单链接到 Contact.php 文件时，它给了我这个错误

错误：表单提交失败，并且没有从以下位置返回错误消息：联系人.php