微信企业现金支付 请求失败 unable to use client certificate (no key found or wrong pass phrase?)

$ch = curl_init ();

$MENU_URL="https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers";
curl_setopt ( $ch, CURLOPT_URL, $MENU_URL );
curl_setopt ( $ch, CURLOPT_CUSTOMREQUEST, "POST" );
curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, FALSE );
curl_setopt ( $ch, CURLOPT_SSL_VERIFYHOST, FALSE );

$zs1='D:\wamp\www\pay\cert.pem';//证书的路径必须是绝对路径，不能写相对路径
$zs2='D:\wamp\www\pay\private.pem';
curl_setopt($ch,CURLOPT_SSLCERT,$zs1);
curl_setopt($ch,CURLOPT_SSLKEY,$zs2);
//curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01;
//Windows NT 5.0)');
curl_setopt ( $ch, CURLOPT_FOLLOWLOCATION, 1 );
curl_setopt ( $ch, CURLOPT_AUTOREFERER, 1 );
curl_setopt ( $ch, CURLOPT_POSTFIELDS, $data );
curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, true);

$info = curl_exec ($ch);

$infos = json_decode($info);