Unreal Lightmass executable is outdated

Development Rendering
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After doing a custom compile of latest 5.1 preview editor source and trying to build my lighting I get the following warning

Warning: Failed to build lighting!!! Unreal Lightmass executable is outdated. Recompile UnrealLightmass project with Development configuration in Visual Studio.

Anyone know how to solve?

2

Yo
Same issue, did u find a fix?

Do this to fix it >

./UnrealEngine_Repo_dir/Engine/Build/BatchFiles/Linux/Build.sh UnrealLightmass Linux Development -verbose

use Win64 instead of Linux if u on windows.

3 Likes
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Happened for me too after building UE 5.1 for macOS as described in Github Readme. Fix:

  • Go to UnrealEngine/Engine/Build/BatchFiles/Mac
  • Exec: ./Build.sh UnrealLightmass Mac Development -verbose
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This worked for me: Debugging lightmass - Gamedev Guide

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5

On Windows:

  • Open Powershell
  • Navigate to UnrealEngine\Engine\Build\BatchFiles
  • Enter command " ./Build.bat UnrealLightmass Win64 Development -verbose "

Worked for me.

17 Likes
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Hey there,
If you are on Windows 64 bits, do the following to fix the issue:

Go to your UnrealEngine folder then Engine>Build>BatchFiles

then open cmd there and type the following command:

Build.bat UnrealLightmass Win64 Development -verbose

and wait then try again, it worked for me :slight_smile:

1 Like
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Thanks, work fine…

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For me too, thanks

9

thanks

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Nice!