# Source 4.26.2 Build Fails with HeadlessChaos Errors

**URL:** <https://forums.unrealengine.com/t/source-4-26-2-build-fails-with-headlesschaos-errors/487230>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine\
**Created:** [August 9, 2021, 10:21pm UTC](https://forums.unrealengine.com/t/source-4-26-2-build-fails-with-headlesschaos-errors/487230 "2021-08-09T22:21:26Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![unit23](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/unit23/32/1146013_2.png) [@unit23](https://forums.unrealengine.com/u/unit23)\
**Post date:** [August 9, 2021, 10:21pm UTC](https://forums.unrealengine.com/t/source-4-26-2-build-fails-with-headlesschaos-errors/487230/1 "2021-08-09T22:21:26Z")

</div>

When building from command line this is the output:

> “c:\UE\SPACEALPHA\_SERVER\SPACEALPHA\_SERVER.sln”  
> (default target) (1) →  
> “c:\UE\SPACEALPHA\_SERVER\Intermediate\ProjectFiles\HeadlessChaos.vcxproj.metaproj”  
> (default target) (2) →  
> “c:\UE\SPACEALPHA\_SERVER\Intermediate\ProjectFiles\HeadlessChaos.vcxproj”  
> (default target) (5) → (Build target)  
> →
> 
> C:/UE/Source-4.26.2/Engine/Source/Runtime/Core/Private/HoloLens/HoloLensPlatformMemory.cpp(65):  
> error C2061: syntax e rror: identifier  
> ‘FMallocTBB’  
> [c:\UE\SPACEALPHA\_SERVER\Intermediate\ProjectFiles\HeadlessChaos.vcxproj]
> 
> C:/UE/Source-4.26.2/Engine/Source/Programs/HeadlessChaos/Private/HeadlessChaosApp.cpp(428):  
> error C4447: ‘main’ signa ture found  
> without threading model. Consider  
> using ‘int  
> main(Platform::ArrayPlatform::String^^  
> args)’. [c:\UE\SPACEAL  
> PHA\_SERVER\Intermediate\ProjectFiles\HeadlessChaos.vcxproj]
> 
> C:\Program Files (x86)\Microsoft  
> Visual  
> Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(45  
> ,5): error MSB3073: The command  
> “C:\UE\Source-4.26.2\Engine\Build\BatchFiles\Build.bat HeadlessChaos HoloLens Debug -Wa  
> itMutex -FromMsBuild” exited with code  
> 6. [c:\UE\SPACEALPHA\_SERVER\Intermediate\ProjectFiles\HeadlessChaos.vcxproj]

**Related**

> [@\[SOLVED\] Visual Studio 2019 Source Build -\> cmd.exe Access Denied](https://forums.unrealengine.com/t/visual-studio-2019-source-build-cmd-exe-access-denied/244582):
>
> So apparently there is no info in regards to an error which complains about a permission issue involving cmd.exe / Build.bat. While there are basic permission issues reported, which can be resolved by running VS as admin, it won’t work in all instances. ERRORS |Warning||Unable to create process C:\WINDOWS\system32\cmd.exe (access denied) |Error|MSB3073|The command C:\UE\Source-4.26.2\Engine\Build\BatchFiles\Build.bat SA\_SERVER Win64 Development -Project=C:\UE\SPACEALPHA\_SERVER\SPACEALPHA\_SERV…