I've searched the web for a solution for a few hours, looked at the console 100 times, and I've come to the conclusion that you need to build the cubemaps with the command "buildcubemaps", but the map file, the "gm_gmall.bps" cannot be written. It's read-only. So I tried to find the file to make it writable, but didn't find it. I only found the workshop file, and a lot of other data files(which were a few bytes), and I made them writable, but that didn't work. So I'm stuck there.

If anyone knows where/how to find that file, or knows another solution for that problem, please comment. Thank you.