Hi Andrej, you'll get that error if you're using v2 or an old pirated version of the v3 beta, which was released before the moi.filesystem.getUIDir() function was added in.

You would need to use the v3 final release version instead of an old cracked beta - the v3 beta test period has been over for quite a while now since the final release and since the v3 betas expire the only way you would be running a v3 beta version is from a cracked version.

I'm glad that you like MoI, but please do not ask for support on the official forum if you're using a pirated version.

Thanks,
- Michael