# Cannot launch session; given errors that I cannot fix.

**URL:** <https://forums.unrealengine.com/t/cannot-launch-session-given-errors-that-i-cannot-fix/2499976>\
**Category:** Issues and Bug Reporting\
**Tags:** unreal-engine, fortnite-creative, unreal-editor-for-fortnite, editor\
**Created:** [May 10, 2025, 3:01am UTC](https://forums.unrealengine.com/t/cannot-launch-session-given-errors-that-i-cannot-fix/2499976 "2025-05-10T03:01:08Z")\
**Posts on this page:** 1\
**Showing post:** 2

<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:** [May 10, 2025, 5:29am UTC](https://forums.unrealengine.com/t/cannot-launch-session-given-errors-that-i-cannot-fix/2499976/2 "2025-05-10T05:29:07Z")

</div>

hi @DRAW12 ,

Looks like your installation is corrupted

Delete directory

```auto
C:\Users\USERNAME\AppData\Local\UnrealEditorFortnite\Intermediate\ValkyrieUploadTemp

```

Verify installation with  
[How to Verify Fortnite/UEFN](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

---

_[View the full topic](https://forums.unrealengine.com/t/cannot-launch-session-given-errors-that-i-cannot-fix/2499976)._