Getting Unknown Error when packaging on Windows

Development Platform & Builds
1

Trying to package my tutorial project and for some reason I keep getting “Unknown Error”. In most cases, I would copy/paste the output log into a LibreOffice document and find warnings like this:
LogMetaSound: MetaSound Engine Initialized
LogStreaming: Warning: Failed to read file ‘…/…/…/Engine/Plugins/Interchange/Editor/Content/Old/Tiles/Outer/alertSolid.png’ error.
LogSlate: Could not find file for Slate resource: …/…/…/Engine/Plugins/Interchange/Editor/Content/Old/Tiles/Outer/alertSolid.png
*Scan for file directory, then this:
LogStreaming: Warning: Failed to read file ‘…/…/…/Engine/Plugins/Interchange/Editor/Content/Old/Tiles/Outer/alertSolid.png’ error.
LogSlate: Could not find file for Slate resource: …/…/…/Engine/Plugins/Interchange/Editor/Content/Old/Tiles/Outer/alertSolid.png
LogEOSSDK: LogEOS: [Boot] EOSSDK Version 1.16.4-36651368 booting at 2025-02-19T20:34:07.391Z using C
LogEOSSDK: LogEOS: [Boot] EOSSDK Platform Properties [OS=Windows/10.0.26100.3037.64bit, ClientId=xyza7891REBVsEqSJRRNXmlS7EQHM459, ProductId=86f32f1151354e7cb39c12f8ab2c22a3, SandboxId=a01927f7421a4d4995673fe30ef46945, DeploymentId=a652a72ea1664dcab3a467891eea5f30, ProductName=Tutorial2D, ProductVersion=++UE5+Release-5.5-CL-39772772, IsServer=false, Flags=DisableOverlay]
LogStreaming: Warning: Failed to read file ‘Common/Selector.png’ error.

LogSlate: Could not find file for Slate resource: Common/Selector.png

EDIT: Found a few more.
LogEOSSDK: Warning: LogEOS: Error response received from backend. ServiceName=[Friend], OperationName=[GetBlockList], Url=[], HttpStatus=[403], ErrorCode=[errors.com.epicgames.common.insufficient_scopes], NumericErrorCode=[1056], ErrorMessage=[Insufficient access scopes. Expected: [friends_list]], CorrId=[EOS-_9Z328N-HUOdGwOFnnLFMg-VKyulb0Waki3YMABgEdMSA]

ATHelper: Cooking (Windows): LogWindows: Warning: Failed to set completion port for job object “UE.ShaderCompileWorker.JobGroup”: The parameter is incorrect.

PackagingResults: Warning: Failed to set completion port for job object “UE.ShaderCompileWorker.JobGroup”: The parameter is incorrect.

2

Hello there @Graystripe2000!

Investigating your errors through the community, they are related to different issues, some of them ended up resolved following engine updates. Yet, there are options to test for your scenario:

  • Test disabling the Fab plugin during packing, this removes most errors and warnings in the process.

  • Removing the Intermediate folder in the error related location, forcing the file to be re-created.

  • Setup packing to a new location, via migrating all useful assets to another, new project, then pack from there.

3

Okay. I think we got a problem now. I was able to fix some of the errors by disabling a few plugins. Others were fixed by going into the folders with errors and adding in the missing files (that’s why the couldn’t be read. There’s this one I can’t seemingly fix, because it’s in the folder but not being read

LogStreaming: Warning: Failed to read file ‘Common/Selector.png’ error.

There’s also one after that related to the cooking even though I cooked the project before packaging.
UATHelper: Cooking (Windows): LogWindows: Warning: Failed to set completion port for job object “UE.ShaderCompileWorker.JobGroup”: The parameter is incorrect.

And then there’s this:
PackagingResults: Warning: Failed to set completion port for job object “UE.ShaderCompileWorker.JobGroup”: The parameter is incorrect.

4

I have these same errors (UE 5.5) Did you find a solution?

5

There are two issues in your log report.
The first is that the files “Common/Selector.png” and “Common/Selector.png” were not successfully found. You should make sure that these files are indexed correctly. If this is an error about internal files, reinstall Unreal Engine.
The second is a Shader Compile Worker error. For this error, I recommend that you update your graphics driver, clean and rebuild your project. If that doesn’t work, reinstall Unreal Engine