Error in Tools - Admin Settings

Hi,
when I go to Tools - Admin Settings in the admin part of ZC, I get the following error message:

1054 Unknown column 'admin_level' in 'field list'
in:
[select admin_id, admin_name, admin_email, admin_pass, admin_level from admin order by admin_name limit 0, 20]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

I do not get any of the user accounts on screen. Anyone who can suggest how I can fix this?

You upgraded your database to v1.5.0 but you're running v1.3.x PHP code on your site.

Why are you doing that?

Thanks for pointing me in the right direction. I upgraded my site and backed up my database. Then I found out that I had problems with 1.5 regarding localization (norwegian language pack), so I "downgraded" and importet det backed up data from 1.5. Silly of me, but I didn't think of the possibility of changes in the database.

Thanks again!