I have set up phpmyadmin for my droplet. It was working fine last night, but as of today I keep getting an error.

I followed this tutorial: https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-phpmyadmin-on-ubuntu-16-04

Image and code of the error:

Warning in ./libraries/session.inc.php#105
 session_start(): open(/var/lib/php/sessions/sess_d4ird29f4per3ljp2li7prhniljibmk4, O_RDWR) failed: Permission denied (13)

Backtrace

./libraries/session.inc.php#105: session_start()
./libraries/common.inc.php#357: require(./libraries/session.inc.php)
./index.php#12: require_once(./libraries/common.inc.php)

I am accessing it via http://000.000.0.000/phpmyadmin/

I have tried clearing my cookies and that is not fixing it either.