UEFN Crash: Shader compilation failures are Fatal

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Summary

When i try to place a Prefab some of them makes my UEFN crash.
like: Slappy Shores Abandoned Factory, Pandora Hearth Shelter, Pandora Container Complex etc

I try to reinstall NVidia driver (latest) and clean reinstall UEFN also. Nothing help.

Steps to Reproduce

Placing prefabs

Expected Result

Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\RHI\Private\PipelineStateCache.cpp] [Line: 375] Shader compilation failures are Fatal.

Observed Result

Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\RHI\Private\PipelineStateCache.cpp] [Line: 375] Shader compilation failures are Fatal.

Platform(s)

PC

Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 1821]
ObjectSerializationError: /Game/Athena/AI/Phoebe/BP_PhoebePlayerController (0xD7774DF62E05B4E3) /Game/Athena/AI/Phoebe/BP_PhoebePlayerController (0xD7774DF62E05B4E3) - BP_PhoebePlayerController_C /Game/Athena/AI/Phoebe/BP_PhoebePlayerController.Default__BP_PhoebePlayerController_C: Bad import index 117440511/69.