ValueError: Unable to insert label!

Running # certbot --apache on CentOS7 getting the below error

]# tail -f /var/log/letsencrypt/letsencrypt.log
File “/usr/lib/python2.7/site-packages/certbot_apache/”, line 95, in _mod_config
File “/usr/lib/python2.7/site-packages/certbot_apache/”, line 170, in _set_up_include_directives
vhost.path, “Include”, self.challenge_conf_pre)
File “/usr/lib/python2.7/site-packages/certbot_apache/”, line 344, in add_dir_beginning
self.aug.insert(first_dir, “directive”, True)
File “/usr/lib/python2.7/site-packages/”, line 369, in insert
raise ValueError(“Unable to insert label!”)
ValueError: Unable to insert label!
2018-02-28 11:35:44,303:ERROR:certbot.log:An unexpected error occurred:

Hi @jndivo,

That’s weird! Could you tell us which version of Certbot (via certbot --version)?

hi, i face the same issue:
the version of my certbot:

certbot --version
certbot 0.21.1

well…i’ve found. confi should contain at least

<VirtualHost *:80>

I missed ServerName entry with my domain

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I’m getting the same error on my first install on Ubuntu 16.04 LTS.
sudo certbot --apache -d

Certbot 0.21.1
<VirtualHost _default_:443>


Do you have the same vHost with port 80?

If you don't, please add it on and try again. (According to @kalyan57

Thanks, once I changed default:443 to *:80 it worked!

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