# uefn crash

**URL:** <https://forums.unrealengine.com/t/uefn-crash/2024270>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fortnite\
**Created:** [September 17, 2024, 10:31am UTC](https://forums.unrealengine.com/t/uefn-crash/2024270 "2024-09-17T10:31:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![FNBRVALOU](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/fnbrvalou/32/948384_2.png) [@FNBRVALOU](https://forums.unrealengine.com/u/FNBRVALOU)\
**Post date:** [September 17, 2024, 10:31am UTC](https://forums.unrealengine.com/t/uefn-crash/2024270/1 "2024-09-17T10:31:48Z")

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### Summary

When I try to launch UEFN I automatically get an error:  
LoginId:53e961714c8e425cb834ca9a251ab106  
EpicAccountId:be53c00282dc464fadd50ceafdd19290

Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\PakFile\Private\IPlatformFilePak.cpp] [Line: 6076] Corrupt pak index detected on pak file: ../../../FortniteGame/Content/Paks/pakchunk99Island-WindowsClient.pak  
I’ve already tried checking the files and reinstalling but the error persists, I can’t access UEFN anymore

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Other

### Steps to Reproduce

Go to Epic Games Store, launch UEFN

### Expected Result

The UEFN should open up

### Observed Result

An error message is displayed directly (the one in the summary).

### Platform(s)

pc

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<div class="post-metadata">

**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:** [September 17, 2024, 3:14pm UTC](https://forums.unrealengine.com/t/uefn-crash/2024270/2 "2024-09-17T15:14:47Z")

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> [@FNBRVALOU](#):
>
> Island-WindowsClient.pak

hi @FNBRVALOU  
You have got corruption in a directory  
In Windows  
Type Windows key + R  
In the box type “cmd”  
Click ok, the windows batch console opens

```auto
cd %USERPROFILE%\AppData\Local\FortniteGame
del/s/q *.*

```

You are emptying corrupted copies of Fortnite code stored in you PC User path which is normally hidden from view

Probably best to run verify afterwards.

[Verify after file problems](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

---

<div class="post-metadata">

**Author:** ![Astrotronic](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/astrotronic/32/1194566_2.png) [@Astrotronic](https://forums.unrealengine.com/u/Astrotronic)\
**Post date:** [September 17, 2024, 3:25pm UTC](https://forums.unrealengine.com/t/uefn-crash/2024270/3 "2024-09-17T15:25:59Z")

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Hi all,

I would strongly advise against using the command line to delete _anything_ unless you are an ‘Elite Programmer’ (aka L33T Programmer 🧙)

Also, the .pak file which is corrupt is not in your \AppData\ folder.

I’ve seen problems like this resolved in the past by deleting the `C:\Program Files\Epic Games\Fortnite\FortniteGame\Content\Paks` folder and then re-verifying the game files through the launcher. (Deleted files will then be re-downloaded)

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<div class="post-metadata">

**Author:** ![FNBRVALOU](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/fnbrvalou/32/948384_2.png) [@FNBRVALOU](https://forums.unrealengine.com/u/FNBRVALOU)\
**Post date:** [September 17, 2024, 9:58pm UTC](https://forums.unrealengine.com/t/uefn-crash/2024270/4 "2024-09-17T21:58:45Z")

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Ok thank you

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<div class="post-metadata">

**Author:** ![FNBRVALOU](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/fnbrvalou/32/948384_2.png) [@FNBRVALOU](https://forums.unrealengine.com/u/FNBRVALOU)\
**Post date:** [September 17, 2024, 9:59pm UTC](https://forums.unrealengine.com/t/uefn-crash/2024270/5 "2024-09-17T21:59:57Z")

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Ok