Hi @Umadhar,
OJS configures PHP to use database-backed sessions (in the sessions table). It looks like your PHP configuration is for some reason still attempting to create file-based sessions. I suspect the cause of this is somewhere in your PHP configuration, but unfortunately I can’t spot it in the phpinfo() output you posted above. You might try something like StackOverflow to get hints on where to look.
Regards,
Alec Smecher
Public Knowledge Project Team