lets证书获取失败

错误代码：

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 www.qidiantb.com
http-01 challenge for qidiantb.com
http-01 challenge for www.weixinxia.cc
http-01 challenge for weixinxia.cc
http-01 challenge for apelevisu.cn
http-01 challenge for www.apelevisu.cn
http-01 challenge for smspare.cn
http-01 challenge for www.smspare.cn
http-01 challenge for 5drc.cn
http-01 challenge for www.5drc.cn
http-01 challenge for moxi888.com
http-01 challenge for www.moxi888.com
http-01 challenge for anziw.com
http-01 challenge for www.anziw.com
http-01 challenge for ynsoft.cc
http-01 challenge for www.ynsoft.cc
Using the webroot path /www/wwwroot/www.weikehu.net for all unmatched domains.
Waiting for verification...
Cleaning up challenges
An unexpected error occurred:
Error creating new cert :: Rechecking CAA: While processing CAA for weixinxia.cc: DNS problem: SERVFAIL looking up CAA for weixinxia.cc, While processing CAA for www.weixinxia.cc: DNS problem: SERVFAIL looking up CAA for www.weixinxia.cc
Please see the logfiles in /var/log/letsencrypt for more details.

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