change frontend language

Hello!
I have installed the template gk_storefront and it´s working fine. But, when I want to change default language to swedish from english the template doesnt work any more.
I get the error code 1146 and something about a database problem with viruemart.
Thankful for help

Similar topic: https://www.gavick.com/forums/storefron ... tion-42545

try to disable module(s) to check if error is causes by them or crappy VM3