Paypal error message - Please help.

Hello:
I'm using opencart 1.5.2.1 with a theme from themeforest called Teez.
Everything's working fine, except for the paypal checkout. After you check the terms and condition and click submit an error message pops up.
"Notice: Error: Unknown column 'shipping_code' in 'field list'
Error No: 1054"
I'm not sure how to proceed from here. Any help would be much appreciated.
Thanks in advance,
Glennerd

shipping_code was not included in 1.5.1.3. Did you upgrade to 1.5.2.1 and not run the SQL? The query is looking for a field that is not there

I am running 1.5.2.1 but, forgive me, I don't know what that means exactly " to run the SQL".
Could you elaborate?
Thanks for your help,
Glennerd

Open your database in PHP MY ADMIN and look in the product table. Now look for a field called shipping_code.