Crashed WordPress

Be careful – immediately after activating the plugin, it crashed and gave the following error. My developers are still trying to access the backend through SFTP to gain access. Right now, we cannot even reach the login page, and the entire site is down.

Fatal error: session_start(): Failed to initialize storage module: user (path: ) in /srv/bindings/d70156b166aa49a0a1e8c75a59bc6b45/code/wp-content/plugins/8-degree-notification-bar/8degree-notification.php on line 207