# can anyone help me ? i have probleme , when i lunch UEFN it says says corrupt or missing files detected **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** unreal-editor-for-fortnite, bug-report, editor, question\ **Created:** [May 10, 2026, 2:12pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174 "2026-05-10T14:12:44Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![M.e.h.d.i](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@M.e.h.d.i](https://forums.unrealengine.com/u/M.e.h.d.i)\ **Post date:** [May 10, 2026, 2:12pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174/1 "2026-05-10T14:12:44Z")
### Summary Hi Guys I fixed this error the solution was uninstalling fortnite and uefn and reinstalling everything, I think the error its linked to fortnite too because uninstalling uefn by itself doesnt fix it It has to be both After updating UEFN and Fortnite when trying to open the editor I get this screen saying corrupt or missing files detected. do you want to verify your installation, fortnite does open, the editor not, ive tried everything so far, verified more than 5 times, manually verified UEFN and Fortntie multiple times, fixed time zone of my pc, repaired my pc files, restarted my pc multiple times, erased cache, deleted engine and binaries folder, repaired both Fortnite and UEFN, and even uninstalling and reinstalling UEFN, nothing seems to work I always end up with that screen ive spent hours trying to fix it and theres no solution please help im still facing this bug from more than 20 days ### Please select what you are reporting on: Unreal Editor for Fortnite ### What Type of Bug are you experiencing? Assets ### Steps to Reproduce update UEFN, click open, error screen shows up press yes = verifying starts but ends up with the same screen when opening again press no = epic launcher screen shows up again ### Expected Result being able to open UEFN ### Observed Result cant open, bug is a cycle of never starting ### Platform(s) PC Windows 11 ### Upload an image ![Screenshot 2026-05-09 165642.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/a/b/1ab3ac3b659855fc47ff307ec77aa072c6c9e67a.png) ### Additional Notes please let me know how can I fix this, im not the only one with this issue ---
**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:** [May 10, 2026, 7:06pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174/2 "2026-05-10T19:06:23Z")
hi @M.e.h.d.i . This is possibly because directory C:\Users%USERNAME%\AppData\Local\ **FortniteGame** is corrupted and possibly the directory files C:\Users%USERNAME%\AppData\Local\ **UnrealEditorFortnite** When deleted Uninstall The Epic Games Launcher (EPGL) Restart PC Download a new version of Epic Games Launcher and login In EPGL Verify the installation [How to verify UEFN/Fortnite](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5) Launch Fortnite from EPGL load the Creative Island then shutdown Fortnite . Launch UEFN from EPGL ---
**Author:** ![M.e.h.d.i](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@M.e.h.d.i](https://forums.unrealengine.com/u/M.e.h.d.i)\ **Post date:** [May 12, 2026, 4:13pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174/3 "2026-05-12T16:13:49Z")
Hy man thnks for helping ! Sorry but the problem persist , i cant run UEFN even after doing that ---
**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:** [May 12, 2026, 11:40pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174/4 "2026-05-12T23:40:47Z")
hi Hopefully you have tried running EPGL/UEFN as “Run as Administrator” Then the most likely thing is your EPGL Account has a problem. Try making a new EPGL account using Email/Password as the other methods require complex linking that can break. If a new account works you need to contact Epic Games player support and ask them to look at why this failed. You need to be running on a non-domain PC with full access to your hard drive and if Windows 11 version 21h4 or higher also need the latest graphics drivers for DX12 ---
**Author:** ![M.e.h.d.i](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@M.e.h.d.i](https://forums.unrealengine.com/u/M.e.h.d.i)\ **Post date:** [May 14, 2026, 2:32pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174/5 "2026-05-14T14:32:20Z")
hy mate ! thnks again for helping i tried what you toldme to do and still nothing , now even the verification cant start … it’s very very strange ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [November 6, 2026, 2:12pm UTC](https://forums.unrealengine.com/t/can-anyone-help-me-i-have-probleme-when-i-lunch-uefn-it-says-says-corrupt-or-missing-files-detected/2721174/6 "2026-11-06T14:12:55Z")
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