ADMILAL
October 13, 2025, 1:43pm
1
Hello, I’m experiencing a critical issue with packaging in UE 5.4.4.
My PC specs:
Output log (only red error messages):
UATHelper: Packaging (Windows): LogThreadingWindows: Error: Runnable thread Background Worker #3 crashed.
UATHelper: Packaging (Windows): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows): LogWindows: Error: Fatal error!
UATHelper: Packaging (Windows): LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000bab4000070
[Callstack] 0x00007ff935a7981b UnrealEditor-Core.dll!UnknownFunction []
[Callstack] 0x00007ff8f04fed6d UnrealEditor-ShaderPreprocessor.dll!UnknownFunction []
[Callstack] 0x00007ff8f04ffd8d UnrealEditor-ShaderPreprocessor.dll!UnknownFunction []
[Callstack] 0x00007ff8f0501eed UnrealEditor-ShaderPreprocessor.dll!UnknownFunction []
[Callstack] 0x00007ff8f0500f6f UnrealEditor-ShaderPreprocessor.dll!UnknownFunction []
[Callstack] 0x00007ff937f245b5 UnrealEditor-RenderCore.dll!UnknownFunction []
[Callstack] 0x00007ff8f8a90303 UnrealEditor-Engine.dll!UnknownFunction []
...
Crash in runnable thread Background Worker #3
What I have tried so far:
Despite these attempts, the same error still occurs during packaging.
Thank you in advance!
(Additional note: I am Japanese, so if anyone who speaks Japanese sees this and can respond in Japanese, it would be greatly appreciated!)
Hello @ADMILAL ,
Switch to DirectX 11 if you’re currently using DirectX 12, then try packaging again.
Make sure your GPU drivers are fully up to date .
Temporarily disable your firewall or antivirus to check if they’re causing any conflicts with Unreal processes
Let me know if it worked!
ADMILAL
October 15, 2025, 4:20pm
3
BRGEzedeRocco:
Switch to DirectX 11 if you’re currently using DirectX 12, then try packaging again.
Make sure your GPU drivers are fully up to date .
Temporarily disable your firewall or antivirus to check if they’re causing any conflicts with Unreal processes
Thank you very much for your reply!
Saved, Intermediate, and DerivedDataCache folders and rebuilt the project
However, even after doing all of these, the problem still persists. The packaging process consistently crashes about 13 seconds after it starts , and I continue to encounter the following error:
UATHelper: パッケージ化 (Windows): LogThreadingWindows: Error: Runnable thread Background Worker #25 crashed. UATHelper: パッケージ化 (Windows): LogThreadingWindows: Error: Runnable thread Background Worker #24 crashed. UATHelper: パッケージ化 (Windows): LogWindows: Error: begin: stack for UAT UATHelper: パッケージ化 (Windows): LogWindows: Error: === Critical error: === UATHelper: パッケージ化 (Windows): LogWindows: Error: UATHelper: パッケージ化 (Windows): LogWindows: Error: Fatal error! UATHelper: パッケージ化 (Windows): LogWindows: Error: UATHelper: パッケージ化 (Windows): LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000e39e000070 UATHelper: パッケージ化 (Windows): LogWindows: Error: UATHelper: パッケージ化 (Windows): LogWindows: Error: [Callstack] 0x00007ff8d7e5981b UnrealEditor-Core.dll!UnknownFunction
The error occurs consistently during the shader processing phase of packaging, and the ShaderPreprocessor.dll is always involved.
Do you have any additional suggestions or ideas on what else I could try to resolve this issue?
ADMILAL
October 15, 2025, 4:22pm
4
This is an image of the same error message
What a shame to hear the issue still isn’t resolved. I looked for posts with similar errors to yours and found a few, but they all mention solutions you’ve already tried.
So here’s what I think you could do next:
Create a new Unreal Engine project (preferably using the same version you’re currently working with), using either the Third Person or *Blank template , it doesn’t matter which.
Try packaging this empty project.
If it works, then the problem is definitely in the content of your original project.
Try disabling any plugins that might be causing conflicts.
You can also try this:
Open your project in the Unreal Editor.
Open the Content Browser .
In the Content* folder, right-click and select “Audit Assets.”
Unreal will scan all your assets and display the results in a window.
Review the results and look for files marked with Errors or Critical Warnings ,those are the most likely causes of the shader compilation failure.
If the empty project also fails to package, the issue could be with the engine itself. In that case, try the following:
Delete the folders mentioned above: Saved, Intermediate, and DerivedDataCache.
Open the Epic Games Launcher .
Locate your engine version.
Click the dropdown next to “Launch” and select “Verify.”
I also found that reinstalling Visual Studio and the SDKs can sometimes help.
ADMILAL
October 16, 2025, 3:15am
6
As instructed, I tried the following pattern.
Created a new project (project_10_16 ) in UE 5.4.4 and attempted packaging → Failed
Verified UE 5.4.4
Tried packaging again with (project_10_16 ) → Succeeded
Tried packaging the main project again → Failed
Deleted the following folders in the main project:
[ProjectRoot]/Intermediate
[ProjectRoot]/Binaries
[ProjectRoot]/Saved
↓Failed to launch Launch succeeded Failed Error message:
Parsing headers for tendeibuckbuck33
Running Internal UnrealHeaderTool ...
Fatal error.
ExitCode = -1073741819
↓Failed Error message:
LogShaderCompilers: Error: Job 0 [Single] Failed: Global/FVolumetricFogLightScatteringCS...
LogShaderCompilers: Error: Job 1 [Single] Failed: Global/FTonemapPS...
...
Fatal error: [File:ShaderCompiler.cpp] [Line: 2055]
ShaderCompileWorker failed
Crash inside the platform compiler
↓Failed Error message:
UATHelper: Packaging (Windows): LogThreadingWindows: Error: Runnable thread Background Worker #3 crashed.
UATHelper: Packaging (Windows): LogThreadingWindows: Error: Runnable thread Background Worker #4 crashed.
UATHelper: Packaging (Windows): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: Fatal error!
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000e654000070
...
[Callstack lines from ShaderPreprocessor.dll / ShaderCompilerCommon.dll / RenderCore.dll follow]
↓Failed Failed Failed project_10_16 ) again → Failed
Switched from DirectX 12 to DirectX 11 and attempted packaging
