class.phpmailer在我们用php发送邮件时出错

当我尝试通过class.phpmailer发送邮件时，它显示以下错误

致命错误：在第1520行的D:\InetPub\vhosts\aaaaaa.com\httpdocs\Class.phpmailer.php中找不到类“SMTP”

主机控制面板

我的代码如下

<?php 

 require_once('class.phpmailer.php');

    $mail = new PHPMailer();
    $mail->CharSet =  "utf-8";
    $mail->IsSMTP();
    $mail->SMTPAuth = true;
    $mail->Username = "user@gmail.com";
    $mail->Password = "password";
    $mail->SMTPSecure = "ssl";  
    $mail->Host = "smtp.gmail.com";
    $mail->Port = "465";

    $mail->setFrom('fromuser@gmail.com', 'AAAA');
    $mail->AddAddress('touser@mail.com', 'BBBB');

    $mail->Subject  =  'using PHPMailer';
    $mail->IsHTML(true);
    $mail->Body    = 'Hi there ,
                        <br />
                        this mail was sent using PHPMailer...
                        <br />
                        cheers... :)';

     if($mail->Send())
     {
        echo "Message was Successfully Send :)";
     }
     else
     {
        echo "Mail Error - >".$mail->ErrorInfo;
     }

?>

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我正在使用主机gator控制面板

您能否共享

class.phpmailer.php

文件的位置？在主机gator控制面板的httpdocs中共享完整路径尝试

require_一次

使用完整路径.y downvote？？方法我不明白