2x: Caution: Can't load skybox file skybox/militia_hdr to build the default cubemap!

[RalphORama]

Describe the bug

I'm trying to compile a map for Garry's Mod. I've added cstrike.fgd in Hammer so I can use CS:S assets in my map. In map properties, I set my skybox to militia_hdr. The map compiles fine through Hammer, but when I compile with CP, I get the following warning:

'Fast' compile finished in 00:00:00
3 errors/warnings logged:
  3 errors/warnings logged for ttt_hillside:
    ● 2x: Caution: Can't load skybox file skybox/militia_hdr to build the default cubemap!
    ● 1x: Info: fastvis = true

Steps to reproduce

1. Open Hammer, from steamapps\common\GarrysMod\bin
2. Open Hammer settings and add cstrike.fgd from CS:S install folder
3. Create a basic map
4. In Map > Map Properties, change skybox to militia_hdr (or any other skybox)
5. Compile the map

Expected behavior

CP would find the proper skybox and not issue a warning.

Debug.log

debug.log

Crash logs

N/a

Additional context

Log from compiling just with hammer: https://pastebin.com/wPe5huE3

Screenshots:

[kilroy98]

Lol, check your "Log from compiling just with hammer:" Line 23-24 same error as in the log from CompilePal. It's not a CompilePal problem.

[Exactol]

Compile Pal is only a wrapper around the compilers that come with the game, this is an error with the material (this error can usually be ignored).