致命错误:未捕获的异常“解析解析异常”，并显示消息“SSL 证书问题:无法获取本地颁发者证书”

这是我第一次使用 parse.com php SDK，我尝试执行以下代码

<?php require '../autoload.php'; 
use Parse'ParseObject;
use Parse'ParseClient;
ParseClient::initialize( "Zsr...", "BzM..", "D..." );
$gameScore = new ParseObject("GameScore");
$gameScore->set("score", 1337);
$gameScore->set("playerName", "Sean Plott");
$gameScore->set("cheatMode", false);
try {
        $gameScore->save();
         echo 'New object created with objectId: ' . $gameScore->getObjectId();
        } catch (ParseException $ex) { 
          // Execute any logic that should take place if the save fails.
          // error is a ParseException object with an error code and message.
          echo 'Failed to create new object, with error message: ' + $ex->getMessage();
    }
?>

但是我得到那个错误

 Fatal error: Uncaught exception 'Parse'ParseException' with message 'SSL certificate problem: unable to get local issuer certificate' in /opt/lampp/htdocs/parse/src/Parse/ParseClient.php:250 Stack trace: #0 /opt/lampp/htdocs/parse/src/Parse/ParseObject.php(925): Parse'ParseClient::_request('POST', '/1/classes/Game...', NULL, '{"score":1337,"...', false) #1 /opt/lampp/htdocs/parse/src/Parse/ParseObject.php(836): Parse'ParseObject::deepSave(Object(Parse'ParseObject), false) #2 /opt/lampp/htdocs/parse/src/hola.php(11): Parse'ParseObject->save() #3 {main} thrown in /opt/lampp/htdocs/parse/src/Parse/ParseClient.php on line 250

教程代码，i我没有改变任何东西，任何人都知道有什么问题？