Assert when linking map due to 't6_skybox'. in Mapping

I'm running into an issue when linking my map. I get an assert, and the map won't load.

Here's the output:

Code Snippet

Plaintext

ASSERTBEGIN -------------------------------------------------------------------

(6 == version)

C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\bin\linker_modtools.exe
q:\t7\pc\code\src\xanim\xmodel_load_obj.cpp:448
ASSERTEND ---------------------------------------------------------------------


  xmodel:skybox_default_black
    gfx_map:maps/mp/mp_alley.d3dbsp
ASSERTBEGIN -------------------------------------------------------------------

(6 == version)

C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\bin\linker_modtools.exe
q:\t7\pc\code\src\xanim\xmodel_load_obj.cpp:448
ASSERTEND ---------------------------------------------------------------------

  xmodel:skybox_default_black
    gfx_map:maps/mp/mp_alley.d3dbsp
ASSERTBEGIN -------------------------------------------------------------------
(6 == version)

C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\bin\linker_modtools.exe
q:\t7\pc\code\src\xanim\xmodel_load_obj.cpp:489
ASSERTEND ---------------------------------------------------------------------

^1ERROR: xmesh 't6_props\vista\skybox\t6_skybox.xmodel_bin' is a collision mesh, not a renderable mesh

  xmodel:skybox_default_black
    gfx_map:maps/mp/mp_alley.d3dbsp
^1Could not parse mesh 't6_props\vista\skybox\t6_skybox.xmodel_bin' for xmodel 'skybox_default_black'
  xmodel:skybox_default_black
    gfx_map:maps/mp/mp_alley.d3dbsp

How do I go about fixing this? I've tried verifying the local files, rebuilding the map, etc. but nothing seems to work. I've found the directory for 't6_skybox' but I cannot find where that file is being used within my map. Any help would be appreciated.

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Assert when linking map due to 't6_skybox'.