LNK 2001 unresolved external symbol

[Javeed_1 (Javeed_)]

Can’t build Unreal Engine from source because of unresolved external symbols:

PKEY_AudioEndpoint_PhysicalSpeakers
PKEY_AudioEngine_DeviceFormat
PKEY_AudioEngine_OEMFormat

I’ve been looking for the solution but couldn’t find any. Any help would be appreciated

[Ari_Epic (Ari Arnbjörnsson)]

Hi @Javeed_1. You sent us a screenshot of the Error List panel in Visual Studio, which is generally not the right panel to see which errors Unreal is giving.

The VS Hints and Errors List panel can be incorrect for a few reasons:

• They’re not aware of all the steps of the build system that UBT uses, so you might get some false positives.
• They will give incorrect errors until the first build of the project as the *.generated.h files haven’t been created yet.

Because of that you should generally ignore the inline hints and Errors List panel.

To know what really failed with a build you should check the text from the Output panel, which prints the text that comes from Unreal Build Tool (UBT). What errors do you get from there?

[Javeed_1 (Javeed_)]

Hi @Ari_Epic . Thanks for the reply.

Build started...
1>------ Build started: Project: UE4, Configuration: Development_Editor x64 ------
1>Building UE4Editor and ShaderCompileWorker...
1>Using Visual Studio 2019 14.29.30147 toolchain (C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133) and Windows 10.0.19041.0 SDK (C:\Program Files (x86)\Windows Kits\10).
1>Building 25 actions with 16 processes...
1>  [1/25] Module.HAPMedia.cpp
1>  [2/25] UE4Editor-HAPMedia.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\HAPMedia\Intermediate\Build\Win64\UE4Editor\Development\HAPMedia\UE4Editor-HAPMedia.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\HAPMedia\Intermediate\Build\Win64\UE4Editor\Development\HAPMedia\UE4Editor-HAPMedia.exp
1>  [3/25] Module.AudioMixerXAudio2.cpp
1>  [4/25] UE4Editor-AudioMixerXAudio2.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\AudioMixerXAudio2\UE4Editor-AudioMixerXAudio2.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\AudioMixerXAudio2\UE4Editor-AudioMixerXAudio2.exp
1>  [5/25] Module.Voice.cpp
1>  [6/25] UE4Editor-Voice.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\Voice\UE4Editor-Voice.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\Voice\UE4Editor-Voice.exp
1>  [7/25] UE4Editor-AudioMixerXAudio2.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\AudioMixerXAudio2\UE4Editor-AudioMixerXAudio2.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\AudioMixerXAudio2\UE4Editor-AudioMixerXAudio2.suppressed.exp
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEndpoint_PhysicalSpeakers
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEngine_DeviceFormat
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEngine_OEMFormat
1>C:\Work\UnrealEngine-4.27.2-release\Engine\Binaries\Win64\UE4Editor-AudioMixerXAudio2.dll : fatal error LNK1120: 3 unresolved externals
1>  [8/25] Module.XAudio2.cpp
1>  [9/25] UE4Editor-XAudio2.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\XAudio2\UE4Editor-XAudio2.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\XAudio2\UE4Editor-XAudio2.exp
1>  [10/25] UE4Editor-Voice.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\Voice\UE4Editor-Voice.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\Voice\UE4Editor-Voice.suppressed.exp
1>  [11/25] UE4Editor-XAudio2.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\XAudio2\UE4Editor-XAudio2.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Intermediate\Build\Win64\UE4Editor\Development\XAudio2\UE4Editor-XAudio2.suppressed.exp
1>  [12/25] Module.AppleProResMedia.cpp
1>  [13/25] UE4Editor-AppleProResMedia.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\AppleProResMedia\Intermediate\Build\Win64\UE4Editor\Development\AppleProResMedia\UE4Editor-AppleProResMedia.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\AppleProResMedia\Intermediate\Build\Win64\UE4Editor\Development\AppleProResMedia\UE4Editor-AppleProResMedia.exp
1>  [14/25] Module.OculusAudio.cpp
1>  [15/25] UE4Editor-OculusAudio.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Runtime\Oculus\OculusAudio\Intermediate\Build\Win64\UE4Editor\Development\OculusAudio\UE4Editor-OculusAudio.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Runtime\Oculus\OculusAudio\Intermediate\Build\Win64\UE4Editor\Development\OculusAudio\UE4Editor-OculusAudio.exp
1>  [16/25] UE4Editor-OculusAudio.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Runtime\Oculus\OculusAudio\Intermediate\Build\Win64\UE4Editor\Development\OculusAudio\UE4Editor-OculusAudio.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Runtime\Oculus\OculusAudio\Intermediate\Build\Win64\UE4Editor\Development\OculusAudio\UE4Editor-OculusAudio.suppressed.exp
1>  [17/25] Module.WmfMedia.cpp
1>  [18/25] UE4Editor-WmfMedia.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\WmfMedia\Intermediate\Build\Win64\UE4Editor\Development\WmfMedia\UE4Editor-WmfMedia.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\WmfMedia\Intermediate\Build\Win64\UE4Editor\Development\WmfMedia\UE4Editor-WmfMedia.exp
1>  [19/25] UE4Editor-HAPMedia.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\HAPMedia\Intermediate\Build\Win64\UE4Editor\Development\HAPMedia\UE4Editor-HAPMedia.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\HAPMedia\Intermediate\Build\Win64\UE4Editor\Development\HAPMedia\UE4Editor-HAPMedia.suppressed.exp
1>  [20/25] UE4Editor-WmfMedia.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\WmfMedia\Intermediate\Build\Win64\UE4Editor\Development\WmfMedia\UE4Editor-WmfMedia.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\WmfMedia\Intermediate\Build\Win64\UE4Editor\Development\WmfMedia\UE4Editor-WmfMedia.suppressed.exp
1>  [21/25] UE4Editor-AppleProResMedia.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\AppleProResMedia\Intermediate\Build\Win64\UE4Editor\Development\AppleProResMedia\UE4Editor-AppleProResMedia.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Media\AppleProResMedia\Intermediate\Build\Win64\UE4Editor\Development\AppleProResMedia\UE4Editor-AppleProResMedia.suppressed.exp
1>  [22/25] Module.OnlineSubsystemUtils.cpp
1>  [23/25] UE4Editor-OnlineSubsystemUtils.lib
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Online\OnlineSubsystemUtils\Intermediate\Build\Win64\UE4Editor\Development\OnlineSubsystemUtils\UE4Editor-OnlineSubsystemUtils.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Online\OnlineSubsystemUtils\Intermediate\Build\Win64\UE4Editor\Development\OnlineSubsystemUtils\UE4Editor-OnlineSubsystemUtils.exp
1>  [24/25] UE4Editor-OnlineSubsystemUtils.dll
1>     Creating library C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Online\OnlineSubsystemUtils\Intermediate\Build\Win64\UE4Editor\Development\OnlineSubsystemUtils\UE4Editor-OnlineSubsystemUtils.suppressed.lib and object C:\Work\UnrealEngine-4.27.2-release\Engine\Plugins\Online\OnlineSubsystemUtils\Intermediate\Build\Win64\UE4Editor\Development\OnlineSubsystemUtils\UE4Editor-OnlineSubsystemUtils.suppressed.exp
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(45,5): error MSB3073: The command "..\..\Build\BatchFiles\Build.bat -Target="UE4Editor Win64 Development" -Target="ShaderCompileWorker Win64 Development -Quiet" -WaitMutex -FromMsBuild" exited with code 6.
1>Done building project "UE4.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 2 up-to-date, 0 skipped ==========

This is the output of the build.

[Ari_Epic (Ari Arnbjörnsson)]

1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEndpoint_PhysicalSpeakers
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEngine_DeviceFormat
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEngine_OEMFormat
1>C:\Work\UnrealEngine-4.27.2-release\Engine\Binaries\Win64\UE4Editor-AudioMixerXAudio2.dll : fatal error LNK1120: 3 unresolved externals

Oh, what do you know, the Errors List panel was right!

This is a really weird error, since these PKEY symbols are properties from the win32 API of Windows
I guess… try deleting the Intermediate folder, uhm… make sure your Windows is updated, your audio drivers updated, check that your DirectX is up to date. I’m not sure, very weird one.

[Javeed_1 (Javeed_)]

Non of these helped unfortunately . I’m getting the same errors.

[Ari_Epic (Ari Arnbjörnsson)]

Have you installed all the required SDKs?

Run the Unreal Engine Prerequisite installer (UERootLocation]\Engine\Extras\Redist\en-us).

Open Visual Studio Installer and click Modify Installation and make sure you have these.

Worksloads:

• Game Development with C++

Individual Components:

• Windows 10 SDK (10.0.19041.0)
• C++ profiling tools
• C++ AddressSanitizer (optional)

If that doesn’t work then I’m all out of ideas

[Javeed_1 (Javeed_)]

@Ari_Epic I’ve checked everything. Everything is installed. But still, not working

DEFINE_PROPERTYKEY(PKEY_AudioEndpoint_PhysicalSpeakers, 0x1da5d803, 0xd492, 0x4edd, 0x8c, 0x23, 0xe0, 0xc0, 0xff, 0xee, 0x7f, 0x0e, 3);
DEFINE_PROPERTYKEY(PKEY_AudioEngine_DeviceFormat, 0xf19f064d, 0x82c, 0x4e27, 0xbc, 0x73, 0x68, 0x82, 0xa1, 0xbb, 0x8e, 0x4c, 0); 
DEFINE_PROPERTYKEY(PKEY_AudioEngine_OEMFormat, 0xe4870e26, 0x3cc5, 0x4cd2, 0xba, 0x46, 0xca, 0xa, 0x9a, 0x70, 0xed, 0x4, 3);

These Keys are all defined, but I am getting this weird error…

[sols000]

In my win32 project, add include <initguid.h>。That solves the problem perfectly.

[sols000]

include <initguid.h>