Buildcubemaps

No matter how many times I put “buildcubemaps” in console, I still get the pink reflections. I tried reloading the map, restarting Gmod. I can’t get it to work.
Anyone had the same problem?

I can’t get buildcubemaps at all.
Every time I use it, it says something about the map being write protected.

My gm_construct has no cubemaps for some reason.

If you get pink reflections try compiling with mat_spectacular 0 first. Then switch mat_spectacular 1