# UEFN not launching

**URL:** <https://forums.unrealengine.com/t/uefn-not-launching/2069792>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, question, fortnite\
**Created:** [October 15, 2024, 4:10pm UTC](https://forums.unrealengine.com/t/uefn-not-launching/2069792 "2024-10-15T16:10:03Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [October 17, 2024, 7:08pm UTC](https://forums.unrealengine.com/t/uefn-not-launching/2069792/5 "2024-10-17T19:08:34Z")

</div>

hi @FreshBeezy ,  
The problems you described are most likely the Graphics controller and the procedure will possibly fix the problem.

Firstly try the Epic Support article  
[How do I force Fortnite to use DirectX 11? - Fortnite Support (epicgames.com)](https://www.epicgames.com/help/en-US/c-Category_Fortnite/c-Fortnite_TechnicalSupport/how-do-i-force-fortnite-to-use-directx-11-a000085695)

Then try this  
[[Solved] How to fix Fatal Errors in UEFN related to Graphic Cards and Shaders and Derived Data problems](https://forums.unrealengine.com/t/solved-how-to-fix-fatal-errors-in-uefn-related-to-graphic-cards-and-shaders-and-derived-data-problems/2080832)

This is set up in a Windows ShortCut

 ![UEFN-DX11-Shortcut](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/8/0/48025e1315b4b3e2c0c38a332bf923b731ed0f74.png)

This is highly technical but it usually fixes the problem

This has been rewritten for UEFN (Unreal Engine Fortnite), which is based on UE 5.5

You need to change the Base system on start-up

Go into Windows File Explorer copy and paste the path

**C:\Program Files\Epic Games\Fortnite\Engine\Config**

Click on to Highlight “BaseEngine.ini”. Right Click “Open with” select Notepad

Control+F find “WindowsTargetSettings” at line 2840

[/Script/WindowsTargetPlatform.WindowsTargetSettings]  
+D3D12TargetedShaderFormats=PCD3D\_SM5  
+D3D11TargetedShaderFormats=PCD3D\_SM5  
bEnableDistanceFields=true  
bEnableRayTracing=true  
bTarget32Bit=false

Add the line at the beginning

**DefaultGraphicsRHI=DefaultGraphicsRHI\_DX11**

so this section looks like

[/Script/WindowsTargetPlatform.WindowsTargetSettings]  
**DefaultGraphicsRHI=DefaultGraphicsRHI\_DX11**  
+D3D12TargetedShaderFormats=PCD3D\_SM5  
+D3D11TargetedShaderFormats=PCD3D\_SM5  
bEnableDistanceFields=true  
bEnableRayTracing=true  
bTarget32Bit=false

Type Control + s. Save the file by closing Notepad and restarting UEFN Editor.  
Your system now uses DefaultGraphicsRHI\_DX11

If you like using the Windows Command shell use the command to pen the file  
notepad C:\Program Files\Epic Games\Fortnite\Engine\Config\BaseEngine.ini

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_[View the full topic](https://forums.unrealengine.com/t/uefn-not-launching/2069792)._