UE 5.8 Crashes at start up

Summary

UE5.8 crashes 10% into startup.

What Type of Bug are you experiencing?

Editor

Steps to Reproduce

Just running 5.8 gives the error

Expected Result

I expect ue5.8 to launch

Observed Result

it crashes

Affects Versions

5.8

Platform(s)

Windows

For crash reports, include your callstack

LoginId:f8bde2a74dfc6a62b4766496486d99a8
EpicAccountId:1bacf741c7214594930d7d16e22f058a

Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\ShaderCore.cpp] [Line: 2894]
Couldn’t find source file of virtual shader path ‘/Engine/Private/ToonProfile.usf’

UnrealEditor_RenderCore
UnrealEditor_RenderCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll