给不带www的域名增加ssl功能，报文中错误，请教如何解决？
看到网上好多人都给自己的网站加了ssl功能，自己也想弄一下，毕竟看着很高大上的样子，跟着网上的教程一路配置好了后，很顺利的就把该功能实现了，自以为自己很了不起，太得意了，以为这么简单就弄好了，还到处去各大社区炫耀，后来有个网友给我说，为啥我不带ＷＷＷ的域名输入会提示不完全链接，应该是没有加ssl功能，我蒙了，随后我从浏览器上试了，果然没有加ssl功能，提示如下图：
但是当我用certbot给不带www的域名添加SSL功能时，居然报错了，我连续重新装了两次都报错，实在不知道问题出在哪里，错误信息贴在下面，麻烦知道的童鞋回复我一下，先谢谢了！
Failed authorization procedure. example.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://example.com/.well-known/acme-challenge/kmL-Hvc4Vk8KSd9qGxuSqBQjQLEurNDK1XGVGQ1cjUk: "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
......
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IMPORTANT NOTES:
- The following errors were reported by the server:
Domain: example.com
Type: unauthorized
Detail: Invalid response from
http://example.com/.well-known/acme-challenge/kmL-Hvc4Vk8KSd9qGxuSqBQjQLEurNDK1XGVGQ1cjUk:
"<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>403 Forbidden</title>
</head><body>
<h1>Forbidden</h1>"
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address.
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