UEFN 33.00 fails to launch

[AlasTMT]

Summary

UEFN 33.00 fails to launch “Unhandled Exception: EXCEPTION_ILLEGAL_INSTRUCTION”

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

Start UEFN.

Expected Result

UEFN starts.

Observed Result

After the aplsh screen appears and finishes loading, the Fortnite Crash Reporter appears.

Platform(s)

PC

Additional Notes

Crash Report (I removed LoginId and EpicAccountId):

Unhandled Exception: EXCEPTION_ILLEGAL_INSTRUCTION

nvrtum64
nvrtum64
nvrtum64
nvrtum64
nvrtum64
nvrtum64
nvrtum64
nvrtum64
nvrtum64
nvwgf2umx
nvwgf2umx
nvwgf2umx
nvwgf2umx
nvwgf2umx
nvwgf2umx
nvwgf2umx
D3D12Core
D3D12Core
D3D12Core
D3D12Core
D3D12Core
D3D12
D3D12Core
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
kernel32
ntdll

[SupportiveEntity]

Hey there @AlasTMT! Welcome to the community! The top level of the error seem to be pointing to an Nvidia graphical DLL nvrtum64. Much like the following DLL nvwgf2umx in the error, there are a number of possible solutions in this thread (mostly geared toward Unreal Engine itself instead of UEFN and primarily for the nvwgf2umx.dll related errors but may assist in this one as well)

500×500 2.84 KB

Hey there @DSchultz2000! Welcome to the community! So the nvwgf2umx portion of this error refers to an Nvidia graphical dll. So more than likely it’s related to GPU settings or drivers. Most time’s I’ve run into this, the fix comes from a few possible angles. Listed in order of most common to least common known fixes: Defaulting your Nvidia 3D settings Disable G-sync in the Nvidia Control Panel Changing to Studio drivers instead of Game Ready drivers (For laptops) Disabling whisper mode in Ge…

Some of these options may not be applicable to UEFN**

[AlasTMT]

Hi and thanks for the answer. Unfortunately none of the suggestions seemed to work.
I should also add that it has all been working fine until this recent UEFN update, and now I’m unable to open the editor.

I would upload logs If the forum would let me (new user is blocked)

[AlasTMT]

Adding “-DX11” as a launch parameter allowed me to start the editor again.