UE 5.8.1 - MetaHuman Character Editor crashes immediately with Assertion failed: bIsInitialized

Development Character & Animation
1

Hello everyone,

I’m experiencing a crash every time I try to create or open a MetaHuman Character in Unreal Engine 5.8.1.

My setup

  • Unreal Engine 5.8.1 (fresh installation)
  • Windows 11
  • 16 GB RAM
  • NVIDIA GPU
  • GTX3050 Vram 6gb
  • First Unreal Engine installation on this PC (no previous UE versions installed)

What happens

As soon as I open MetaHuman Character Editor from the Content Browser (or try to create a new MetaHuman Character), Unreal Engine crashes immediately.

The Crash Reporter shows:



Assertion failed: bIsInitialized

File:
Engine\Plugins\MetaHuman\MetaHumanCharacter\
Source\MetaHumanCharacterEditor\Private\
MetaHumanCharacterEditorSubsystem.cpp

What I have already tried

  • Fresh installation of UE 5.8.1
  • Verified the engine through Epic Games Launcher
  • Created a completely new Blank project
  • Enabled all MetaHuman plugins
  • Installed MetaHuman Creator Core Data
  • Confirmed Fab is installed and working
  • Deleted Unreal Engine cache (DerivedDataCache)
  • Restarted the computer
  • The crash still happens every time.

Additional information

The engine itself works normally.

The crash only occurs when opening the MetaHuman Character Editor.

According to the log, the assertion occurs because bIsInitialized is false, suggesting that the MetaHuman Character Editor subsystem is not initializing correctly.

Has anyone experienced the same issue, or does anyone know what could prevent the MetaHuman Character Editor subsystem from initializing?

Any help would be greatly appreciated.

Thank you!

2

Hello there @Baduong1993!

That error you are getting, the “Assertion failed: bIsInitialized” tied to “MetaHumanCharacterEditorSubsystem.cpp”, indicates UE crashed while trying to access the Metahuman UI, as something blocked the process. Checking across the community, that type of crash would suggest a failed check, or a missing component from the install. But you already ruled out most of those options, with a fresh install, and using a blank project. Which means, something else is causing this, beyond the engine install itself.

First thing I would ensure, is that all plugins tied to MetaHuman are added and present in the project you are testing. This includes animation plugins like RigLogic and LiveLink.

Next, for another factor outside UE, your current GPU drivers. I would suggest a clean install, using a tool like DDU, then get the latest version of nVidia’s studio drivers, instead of the game drivers.

As for your test project, make sure it’s configured to use DX12 as target RHI, and that your shader format is set to SM6

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If the issue persists, then we will need to know more about the crash itself. There should be a full crash log in your test project’s Saved/Logs/[ProjectName].log, or even in your local app data at C:\Users[Your Windows Username]\AppData\Local[Project Name]\Saved\Crashes. If you can find either of them, and share in the thread, we can investigate further.