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 3								 This topic has been pinned, so it's probably important
  This topic has been pinned, so it's probably important	 
					




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Then you most likely mounted it incorrectly. As there are no custom textures for the skybox. "sky_st_day_01"
Make sure you mounted it through:
"(your own drive):\SteamLibrary\steamapps\common\GarrysMod\garrysmod\cfg" --> mount.cfg
and the mount path is:
"bms" "(your own drive):\SteamLibrary\steamapps\common\Black Mesa\bms"
Have you tried to disable all of your addons to see if that fixes it?
Did you mount Black Mesa correctly?