check your db game_users, the table might be missing or miss spelt if u have moddfied it, i did the mistake of messing with things in my first attempt at adding things like new tech.
but it sounds asif ur a table missing in your db. but i could be wrong XD. it really isnt much to go on, but sometimes it dosnt give u anuff to figure it out right away. try applying some game fixes ppl have made, might help or it might not.