Failed to load Windows Mixed Reality Interop Library - UE 4.23

[scadl]

Hello. I getting this error, while running my packaged game. I'm packaging with Win64 target.
I used same setting on UE 4.22.3 GitHub, and packaged my game, which running without any errors.

• I tried to rebuild the MixedRealtityInterop plugin (from Engine/Source/Plugins/ThirdParty) -- didn't help.
• I tried to install binary version of UE 4.23.0 (Epic Launcher) -- same problem there.

So, where should I look?

[benew]

Yeah... I have exactly the same problem...

[ItsNotMeTrustMe]

Had this same problem. I got it working again by copying a few lines from the 4.22 branch into 4.23. In 'WindowsMixedRealityHMD.cpp', you'll see a comment "// Then finally try to load the WMR Interop Library" and the error message is right after that. Before that comment, around line 174, add this:

FString PerceptionSimulationDLLPath = EngineDir / "Binaries" / BinariesSubDir / "Microsoft.Perception.Simulation.dll";
FString HolographicStreamerDesktopDLLPath = EngineDir / "Binaries" / BinariesSubDir / "HolographicStreamerDesktop.dll";

void* PerceptionSimulationDLLHandle = FPlatformProcess::GetDllHandle(*PerceptionSimulationDLLPath);
void* HolographicStreamerDesktopDLLHandle = FPlatformProcess::GetDllHandle(*HolographicStreamerDesktopDLLPath);

[benew]

Thanks for reply!
Hmm I think will wait for fix in Launcher Version...

[scadl]

Had this same problem. I got it working again by copying a few lines from the 4.22 branch into 4.23. In 'WindowsMixedRealityHMD.cpp', you'll see a comment "// Then finally try to load the WMR Interop Library" and the error message is right after that. Before that comment, around line 174, add this:

FString PerceptionSimulationDLLPath = EngineDir / "Binaries" / BinariesSubDir / "Microsoft.Perception.Simulation.dll";
FString HolographicStreamerDesktopDLLPath = EngineDir / "Binaries" / BinariesSubDir / "HolographicStreamerDesktop.dll";

void* PerceptionSimulationDLLHandle = FPlatformProcess::GetDllHandle(*PerceptionSimulationDLLPath);
void* HolographicStreamerDesktopDLLHandle = FPlatformProcess::GetDllHandle(*HolographicStreamerDesktopDLLPath);

And I CONFIRM that this solution really works for me! So ItsNotMeTrustMe, you saved my day, and not only one!
To everyone, who will use this, I strongly recommend to rebuilt MixedRealtityInterop plugin before repacking your game!

[User-970075953]

Had this same problem. I got it working again by copying a few lines from the 4.22 branch into 4.23. In 'WindowsMixedRealityHMD.cpp', you'll see a comment "// Then finally try to load the WMR Interop Library" and the error message is right after that. Before that comment, around line 174, add this:

FString PerceptionSimulationDLLPath = EngineDir / "Binaries" / BinariesSubDir / "Microsoft.Perception.Simulation.dll";
FString HolographicStreamerDesktopDLLPath = EngineDir / "Binaries" / BinariesSubDir / "HolographicStreamerDesktop.dll";

void* PerceptionSimulationDLLHandle = FPlatformProcess::GetDllHandle(*PerceptionSimulationDLLPath);
void* HolographicStreamerDesktopDLLHandle = FPlatformProcess::GetDllHandle(*HolographicStreamerDesktopDLLPath);

Thanks for posting this - saved me some time debugging it. Should really have been picked up in QA as it seems any use of the WMR plugin in a build will fail.