UE5 crash when opening editor: "Shader compilation failures are Fatal."

[personthebob]

The editor was working fine for a while until this started happening. It always happens right after all the loading is done and the editor opens, freezes for like 10 seconds, and crashes. Full error:

Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\RHI\Private\PipelineStateCache.cpp] [Line: 238] Shader compilation failures are Fatal.

UnrealEditor_RHI

UnrealEditor_RHI

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

UnrealEditor_Core

kernel32

ntdll

This is the code I’m getting every time I try to start up UE5.1.1. Please if someone could help and point me in the right direction as to how to fix this I would be very appreciative. I have already tried uninstalling and reinstalling multiple times. I have uninstalled and reinstalled and updated all my graphics and chipset drivers etc. for my Windows 10 computer. Please and thank you for your time

[DRABOT]

Same for me

[mekatzer]

Solved by editing Config/DefaultEngine.ini, Line 25:

DefaultGraphicsRHI=DefaultGraphicsRHI_DX12 → DefaultGraphicsRHI=DefaultGraphicsRHI_DX11

[mekatzer]

+1, was working fine earlier today.

Have tried deleting deriveddatacache and intermediate, switched from game ready → studio drivers, several restarts, no dice

[K9Cubed]

Sadly this is not a solution for anyone using Lumen and nanite as the are only supported by dx12

[Black_Photon]

I’ve been getting this issue as well, but I’ve discovered for me it only occurs when hardware raytracing is enabled. This is with a new install of UE5.1.1. I’ve looked into the options recommended, but my graphics driver is already up-to-date, and I can’t find the options to clear the cache where specified. Is there a certain directory I can delete? Or perhaps the options have moved.

[K9Cubed]

Bump. Still an ongoing issue for many of us.

[Black_Photon]

Update - I tried uninstalling 5.1.1 and reinstalling 5.2.1 and gave it another try, and now it seems to work fine for me

[Alessiana]

CHAT GPT Answer, we failed

[oshevoshev]

@GouthamMannuru

• Edit > Project Settings > Engine > Rendering > Shader Cache, and click “Clear Cache”.
• Update your graphics drivers: Outdated or corrupt graphics drivers can cause issues with shader compilation. Try updating your graphics drivers to the latest version.
• Delete your Derived Data Cache: The Derived Data Cache is a cache of compiled assets and data generated by the Unreal Engine. Sometimes, corrupted or outdated data in the cache can cause issues. To delete the cache, go to Edit > Project Settings > Engine > General Settings > Derived Data Cache, and click “Purge Cache”.

Don’t waste your time with this auto-generated answer. There are no such buttons as Edit > Project Settings > Engine > Rendering > Shader Cache → “Clear Cache” and Edit > Project Settings > Engine > General Settings > Derived Data Cache → “Purge Cache”.

Shame on you posting such things without checking.