So I'm working on another map to test myself. (Still new to mapmaking. Have the theory down, focusing on lighting atm) In my last post, I had some problems with the map not compiling. Was directed to Interlopers.net, fixed the problem from there. Fixed shortly thereafter. Working on a new map. Still nothing serious (yet). I'm trying to compile, and I notice it runs another map under a similar name. (Named this Test 1, runs a REALLY early (like 6 months ago) map called Test (where I tested water, spawns, resupply and stairs (REALLY early))) I went over to interlopers and tried to figure out what was wrong. Found a few leaks, patched them up, can't find any more. One error stayed there, and I have NO idea what it is or means. Here it is: Can't load skybox file skybox/sky_tf2_04 to build the default cubemap! Description: You have entered a skybox texture which doesn't seem to be valid. Make sure you don't specify the last three letter (_UP, _DN, etc) of any skybox texture you use. You may also need to fix your vmt files if they are broken. It may also be caused by compiling a non-HDR skybox texture. Any help?