Hesk Error "Cannot start a new session" after PHP7 upgrade

[ajcke]

Script URL: hn.k12.oh.us/helpdesk
Version of script: 2.7.3
Hosting company: My ISP, a government organization
URL of phpinfo.php: http://hn.k12.oh.us/phpinfo.php
URL of session_test.php: http://hn.k12.oh.us/helpdesk/session_test.php
What terms did you try when SEARCHING for a solution: "Cannot start a new session", PHP 7, Hesk

Write your message below:
My ISP upgraded their PHP version to 7 this week. Now when we go to the admin area of hesk we receive an error "cannot start a new session" where the login text boxes should be.

I tried to upgrade after we noticed this error from hesk 2.7.3 with hesk 2.8.2 but the install returned the same error on the page. What would get us back up and running?

[Klemen]

This is usually a PHP configration issue.

session.save_path is set to /var/lib/php/session on you
r server. Make sure this path is writable by PHP and/or change it to a path such as /tmp in ypur PHP configuration; check woth ypur host for more info.