Document root [var/www/html] does not exist
I'm fairly new in setting up a server and I'm sorry in advance for not being as techinically detailed with my problem but here is the gist of my problems.
So just 4 days ago I created my droplet for my WordPress site following this tutorial. https://www.wpexplorer.com/install-wordpress-digitalocean/
It worked perfectly at first and I begin working on the site installing a theme and got some considerate work done. Then, the very next day the site was working through the domain (which is the IP address) however the wp-admin wasn't. Then, I tried logging into the console of Digital Ocean and it asked me to enter my username and password yet again; it basically functioned like I was creating a site for the first time again. It asked me to set up my domain (again) and I chose the same IP address for domain. However, this time the site didn't load at all giving me the error
The requested URL was not found on this server.
Apache/2.4.29 (Ubuntu) Server at 220.127.116.11 Port 80
Also, I'm getting the error message that state
Warning : DocumentRoot [/var/www/html] does not exist apache2 could not reliably determine the server's fully qualified domain name using [IP Address] set the 'Server Name' directive globally to suppress this message. Virtual Host Configuration *:80 (Domain Name) (etc/apache2/sites-enabled-000-default.conf:4