Default [Q] Themer not working for ROM

Hi guys I just got an LG G2 and flashed a custom rom on it (CloudyFlex). I want to use Themer from the appstore however it seems that they "do not support" my phone at the moment.

I was wondering if is it just me (my settings) or is it the ROM itself that is incompatible with the app. Which one is it?

Thank you in advanced.