# Fatal Error opening UEFN Project **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** fortnite-creative, unreal-editor-for-fortnite, question, fortnite\ **Created:** [October 9, 2024, 4:12pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432 "2024-10-09T16:12:16Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Cleverlike\_Studios](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/cleverlike_studios/32/1216891_2.png) [@Cleverlike\_Studios](https://forums.unrealengine.com/u/Cleverlike_Studios)\ **Post date:** [October 9, 2024, 4:12pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/1 "2024-10-09T16:12:16Z")
### Summary When opening a project in UEFN v31.30 the engine crashes. This crash did not occur in UEFN v31.20 Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\RenderCore\Private\ShaderParameters.cpp] [Line: 26] Failure to bind non-optional shader resource parameter OutTarget0! The parameter is either not present in the shader, or the shader compiler optimized it out. ### Please select what you are reporting on: Unreal Editor for Fortnite ### What Type of Bug are you experiencing? Engine Crash ### Steps to Reproduce Open Project. See attached video ### Expected Result Project will not crash the engine when trying to open it. ### Observed Result Engine crashes when trying to open the project. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/5/c/75cc3ab68007b0a947d36a7dfd203b5885ff0714.png) ### Platform(s) PC ### Island Code 0909-1879-4957 ### Additional Notes Crash Logs [UECC-Windows-6689E0044154D4740F5CCEBEF23EA024\_0000.zip](https://forums.unrealengine.com/uploads/short-url/jejpj1YbibeBbgE9s1m3gtHdNbu.zip) (277.0 KB) ---
**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 9, 2024, 7:03pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/2 "2024-10-09T19:03:14Z")
hi @Cleverlike_Studios Your error log contains > Guid format shader working directory is -4 characters bigger than the processId version (C:/Users/yourName/AppData/Local/UnrealEditorFortnite/Intermediate/Shaders/WorkingDirectory/30488/). This shows the corrupted shader area which is NOT cleared by verifying your UEFN installation. There are lots of leftover files from the earlier UEFN versions. This was solved in the post [31.20 [Solved] UEFN Fix Validation Error pop up wont “Run” - General / Issues and Bug Reporting - Epic Developer Community Forums (unrealengine.com)](https://forums.unrealengine.com/t/31-20-solved-uefn-fix-validation-error-pop-up-wont-run/2024338/2) This clears the areas programmatically ---
**Author:** ![Cleverlike\_Studios](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/cleverlike_studios/32/1216891_2.png) [@Cleverlike\_Studios](https://forums.unrealengine.com/u/Cleverlike_Studios)\ **Post date:** [October 11, 2024, 7:15pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/3 "2024-10-11T19:15:50Z")
Thanx for getting back to me on this. I’ve tried this yesterday, and the .bat deleted only what was in the downloads folder (where I saved the “UEFNfixRun2.txt” file). Note: I did change the file paths in the UEFNfixRun2.txt to match the user name, as running it without changing the user name gave the error that the path did not exist. So my next step was to - Close UEFN - Manually delete the “intermediate” folder - Restart UEFN - Reopen the project in question This process did not fix the issue. Would you suggest also deleting the “Saved” folder? Thanx for you assistance and help 🙂 -Ian ---
**Author:** ![Cleverlike\_Studios](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/cleverlike_studios/32/1216891_2.png) [@Cleverlike\_Studios](https://forums.unrealengine.com/u/Cleverlike_Studios)\ **Post date:** [October 18, 2024, 4:17pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/4 "2024-10-18T16:17:20Z")
Checking back in with this. Any progress or suggestions? ---
**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 18, 2024, 5:24pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/5 "2024-10-18T17:24:44Z")
hi @Cleverlike_Studios Working on a similar problem [2024.10.18-02.34.52:241][0]LogShaderCompilers: Display: Compiling shader autogen file: C:/Users/jxxx/AppData/Local/UnrealEditorFortnite/Intermediate/ShaderAutogen/PCD3D\_SM5/AutogenShaderHeaders.ush The Shader settings are wrong yours is PCD3D\_SM6 [2024.10.09-16.12.47:884][0]LogShaderCompilers: Display: Compiling shader autogen file: C:/Users/ixxx/AppData/Local/UnrealEditorFortnite/Intermediate/ShaderAutogen/PCD3D\_SM6/AutogenShaderHeaders.ush First, try the easier shortcut to UEFN and add DX11 as an Additional Parameter ![UEFN-DX11-Shortcut](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/8/0/48025e1315b4b3e2c0c38a332bf923b731ed0f74.png) in this picture, copy and paste the line below we need to add Dx11 and sm5 to give -d3d11 -sm5 at the end of Target box ```auto "C:\Program Files\Epic Games\Fortnite\FortniteGame\Binaries\Win64\UnrealEditorFortnite-Win64-Shipping.exe" -d3d11 -sm5 ``` Now start UEFN from the Desktop Shortcut Update remove the highly technical text as of 32.00 the control file .ini no longer exista ---
**Author:** ![Cleverlike\_Studios](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/cleverlike_studios/32/1216891_2.png) [@Cleverlike\_Studios](https://forums.unrealengine.com/u/Cleverlike_Studios)\ **Post date:** [October 18, 2024, 8:25pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/6 "2024-10-18T20:25:47Z")
Thank you for getting back to me. I will try this and get back to you. ---
**Author:** ![Cleverlike\_Studios](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/cleverlike_studios/32/1216891_2.png) [@Cleverlike\_Studios](https://forums.unrealengine.com/u/Cleverlike_Studios)\ **Post date:** [October 21, 2024, 5:55pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/7 "2024-10-21T17:55:49Z")
🫡That worked. Thanx for the assist. Here is a quick TL;DR tutorial to address this issue. ---
**Author:** ![Fallen-Champ](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fallen-Champ](https://forums.unrealengine.com/u/Fallen-Champ)\ **Post date:** [October 21, 2024, 10:59pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/8 "2024-10-21T22:59:13Z")
> [@Jimbohalo10](#): > > `-d3d11 -sm5` ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/d/4/4d49ed5ef618d833aee364e2067bd7ced217d50b.jpeg) Will have another go at doing this tomorrow, found the location but must have done it wrong Thanks for the info That above was after adding -d3d11 -sm5 This was the original issue - I am back to this now ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/1/9/2196a7aed389727227c06b26c17617bb67b0746d.png) ---
**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 23, 2024, 9:30pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/9 "2024-10-23T21:30:20Z")
hi @Fallen-Champ , Please refer to the new thread [[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/2080832/2) ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [November 22, 2024, 9:31pm UTC](https://forums.unrealengine.com/t/fatal-error-opening-uefn-project/2060432/10 "2024-11-22T21:31:14Z")
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