Your PHP configuration seems to not allow listing of active sessions

I get the following error message while I try to access User Sessions

Your PHP configuration seems to not allow listing of active sessions. The directory used to save sessions (C:\dolibarr\temp) may be protected (for example by OS permissions or by PHP directive open_basedir)

open_basedir is still commented in php.ini

It was working perfectly till yesterday and no changes were made after that.
What could be the reason for this?
I’m running in Windows 10 with manually installed Apache server.
.

This is due to folder permission . I don’t know about window , but On Linux sessions are stored in /var/lib/php/sessions. and by default is owned by user “root” and group “root” , dolibarr setting as far as i could find assigns www-data as user and group. so changing folder permission to www-data will fix this .
cd to /var/lib/php
sudo chown -R www-data:www-data .

hope this helps