I've installed the FrameMarket theme and MarketPress plugin

Hi.
I've installed the FrameMarket theme and MarketPress plugin at my site, and wanted to install a child theme as well. I read around the forums that you can use other themes than GridMarket as child Themes, but I can't get my selected theme to work correct.

I'm using an Ecommerce theme called virtue and it can currently be seen at my site crate.dk

Am I doing something wrong, or is it just not possible to use this theme as a child theme of FrameMarket.

Thanks in advance.

/Jonas