Your server is unable to create a session necessary for AbanteCart functionality. Check logs for exact error details and contact your hosting support administrator to resolve this error.
my server is update php 8 form php 7.4.
My website stop working so change again PHP 7.4 but now my add to card button and other function are not working same as i try to login as an admin but it's show me above error.
Please Help Talk with hosting provider but they say problem with you coding site.