证书无效是什么原因啊

证书获取失败，返回如下错误信息：

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Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for shenyang.wxfenfen.com
Using the webroot path /www/wwwroot/shenyang.wxfenfen.com for all unmatched domains.
Waiting for verification...
Cleaning up challenges
An unexpected error occurred:
There were too many requests of a given type :: Error creating new cert :: too many certificates already issued for exact set of domains: shenyang.wxfenfen.com
Please see the logfiles in /var/log/letsencrypt for more details.

好像是这个域名wxfenfen.com，申请的证书有点多？

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