ERROR: Site example.com does not exists! – Apache a2ensite command

Problem: ERROR: Site example.com does not exists!

This error I have faced when created a new virtual host in Apache on my Ubuntu system. I create a virtual host configuration file in /etc/apache2/sites-available/ directory with name example.com. Now I tried to enable the website using a2ensite command and faced the following issue.

a2ensite example.com 

ERROR:  Site example.com does not exists!

Solution:

The problem was that all virtual host configuration files must have .conf extension in their filename. So I simply renamed example.com with example.com.conf.

cd /etc/apache2/sites-available/
mv example.com example.com.conf

and again tried to enable website using same command and this time I found its working properly.

a2ensite example.com