how to run Lyra code and open it in UE5

Development Getting Started & Setup
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1

Hi everyone,

I cloned the Unreal Engine 5 repository and compiled it using make on my Ubuntu 24 system.

Now I want to open the Lyra project in UE5, so I tried running the following commands:

  1. ~/UnrealEngine/Engine/Build/BatchFiles/Linux/Build.sh LyraEditor Linux Development ~/UnrealEngine/Samples/Games/Lyra/Lyra.uproject
  2. ~/UnrealEngine/Engine/Binaries/Linux/UnrealEditor ~/UnrealEngine/Samples/Games/Lyra/Lyra.uproject

UE5 launches, but it crashes during loading with the following error:

[2025.06.16-15.01.51:135][ 0]LogCore: Error: appError called: Fatal error: [File:./../../Samples/Games/Lyra/Source/LyraGame/System/LyraAssetManager.cpp] [Line: 186]
Failed to load GameData asset at /Game/DefaultGameData.DefaultGameData. Type LyraGameData. This is not recoverable and likely means you do not have the correct data to run Lyra.
0x00007eba58d2b569 libUnrealEditor-LyraGame.so!ULyraAssetManager::LoadGameDataOfClass(TSubclassOf, TSoftObjectPtr const&, FPrimaryAssetType) [/home/roee/Projects/UnrealEngine/Engine/Source/./../../Samples/Games/Lyra/Source/LyraGame/System/LyraAssetManager.cpp:186]

What’s the problem here, and how can I get the missing data?

2

Hello there @RoeeRoee903!

Investigating around the community, another thread encountered the same error with Lyra, and resolved it via changing how to project was migrated. Please check below for details:

Alternatively, another thread suggest to manually force the setup and projects files, to fetch all binary content, for example:

cd ~/UnrealEngine/Samples/Games/Lyra
git lfs install
git lfs pull
./GenerateProjectFiles.sh