VB 5 - Urgent Issue, please help

[fadiodeh]

Dear,

I have this issue on my forum,

Fatal error: Class 'vB_Session_Web' not found in /var/www/vhosts/airssforum.com/httpdocs/core/vb/session/webapi.php on line 18

please note this issue appear without make any changes on my forums on admincp or files or database.

I tried to repair database but still have same issue also i got same error when trying access admincp

any help please

[In Omnibus]

If I understand this correctly the web API is not reading the datastore.

Which PHP version are you using?

Do you have memcached or another type of caching?

Do you have mbstring enabled?