Weird SQL errors after clean installing Betav2.0

Good day People,

I know mooffie and quicksketch got their hands full but I am running into a weird problem and I dont know how to tackle. I recently installed flag-6.x-2.0-beta-2 after banging my head on the computer table for the past couple days trying to get anonymous users to voluntarily flag comments for abuse and spam. However, after installation this is the error I got:

user warning: Unknown column 'sid' in 'where clause' query: SELECT * FROM flag_content WHERE content_type = 'node' AND content_id = 59 AND (uid = 0 OR uid = 0) AND sid = 1 in /httpdocs/sites/all/modules/flag/flag.module on line 1479.

Is there something I am doing wrong here that I am not seeing? When no tags are created everything is ok but when I create a test flag it throws me this error. Thanks in advance.

Nota bene: Session module is also installed.