后台发起退款的时候，出现了服务器 500 错误。

大佬们，我后台提交退款时， Response提示这个，怎么回事
"message": "cURL error 60: SSL certificate problem: unable to get local issuer certificate (see http://curl.haxx.se/libcurl/c/libcurl-erro...)",
"exception": "GuzzleHttp\Exception\RequestException",
"file": "D:\Web\www\myshop\vendor\guzzlehttp\guzzle\src\Handler\CurlFactory.php",
"line": 186,
"trace": [
{
"file": "D:\Web\www\myshop\vendor\guzzlehttp\guzzle\src\Handler\CurlFactory.php",
"line": 149,
"function": "createRejection",
"class": "GuzzleHttp\Handler\CurlFactory",
"type": "::"
},