Unable to load lighthouse driver, VRInitError_Init_FileNotFound

[NuAoA]

I'm attempting to use SteamVR without a hmd with some TundraTrackers and I'm running into the following error when SteamVR is loading the lighthouse drivers.

Unable to load driver lighthouse from C:\SteamVR\drivers\lighthouse\bin\win64\driver_lighthouse.dll (126)
ASSERT: "DriverManager lighthouse load error 126u" at c:\buildslave\steamvr_rel_win64\build\src\common\vrcommon\drivermanager.cpp:405.
Unable to load driver lighthouse because of error VRInitError_Init_FileNotFound(103). Skipping.

I'm not sure what file it can't find. I've installed the MSVC package and DirectX.

The odd thing is my gaming machine runs everything fine. The dev machine is giving me problems.

[TobiSchluter]

In my experience, this usually means that a dll file is missing that is required by driver_lighthouse.dll

You can try to figure out which with a dependency walker, but it's probably easiest to reinstall SteamVR.