# UEFN session not starting after the update (Failed to create module version)

**URL:** <https://forums.unrealengine.com/t/uefn-session-not-starting-after-the-update-failed-to-create-module-version/2048232>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, bug-report, editor, fortnite\
**Created:** [October 1, 2024, 5:59pm UTC](https://forums.unrealengine.com/t/uefn-session-not-starting-after-the-update-failed-to-create-module-version/2048232 "2024-10-01T17:59:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Arsi](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/arsi/32/913578_2.png) [@Arsi](https://forums.unrealengine.com/u/Arsi)\
**Post date:** [October 1, 2024, 5:59pm UTC](https://forums.unrealengine.com/t/uefn-session-not-starting-after-the-update-failed-to-create-module-version/2048232/1 "2024-10-01T17:59:40Z")

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### Summary

Hi there,  
So I tried launching a session after today’s update for my island that i had no problem working on so far, now every time i get to the default waiting lobby for UEFN and it just fail on the “uploading” process and says this in the output log:

LogValkyrieSummary: Creating Module Version  
LogValkyrieSyncProject: Error: CreateModuleVersion error: Failure ErrorCode=errors.com.epicgames.pre-processing.failed, Message=MODULE VALIDATION FAILED (job f65333e8-8f15-4929-9644-1d7248930e5a):  
Failed downloading the source assets for job, Raw={  
“host”: “[content-service.bfda.live.use1a.on.epicgames.com](http://content-service.bfda.live.use1a.on.epicgames.com)”,  
“method”: “GET”,  
“path”: “/api/content/v2/module/9fa4ac3e-4bee-5081-5a94-a1a9022553d3/poll/f65333e8-8f15-4929-9644-1d7248930e5a”,  
“errorCode”: “errors.com.epicgames.pre-processing.failed”,  
“errorMessage”: “MODULE VALIDATION FAILED (job f65333e8-8f15-4929-9644-1d7248930e5a):\nFailed downloading the source assets for job”  
}  
LogValkyrieSyncProject: Error: CreateModuleVersions failed: see log for details

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Live Edit

### Steps to Reproduce

Launch session after the update

### Expected Result

session launched

### Observed Result

Session doesn’t launch fully (Fortnite opens up and launches the default UEFN lobby) and then fail with error: “Failed to create module version”

### Platform(s)

pc - windows 11

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<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [October 1, 2024, 7:54pm UTC](https://forums.unrealengine.com/t/uefn-session-not-starting-after-the-update-failed-to-create-module-version/2048232/2 "2024-10-01T19:54:24Z")

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We’re checking into this, @Arsi

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<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [October 2, 2024, 9:31am UTC](https://forums.unrealengine.com/t/uefn-session-not-starting-after-the-update-failed-to-create-module-version/2048232/3 "2024-10-02T09:31:58Z")

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It looks like you’ve resolved the issue?

---

<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:** [October 2, 2024, 1:25pm UTC](https://forums.unrealengine.com/t/uefn-session-not-starting-after-the-update-failed-to-create-module-version/2048232/4 "2024-10-02T13:25:47Z")

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Hi @Arsi , @Flak ,

> LogValkyrieSummary: Creating Module Version  
> LogValkyrieSyncProject: Error: CreateModuleVersion error: Failure ErrorCode=errors.com.epicgames.pre-processing.failed, Message= **MODULE VALIDATION FAILED** (job f65333e8-8f15-4929-9644-1d7248930e5a):  
> Failed downloading the source assets for job, Raw={

The answer is was posted before in  
[How can I fix “Module Validation Failed”](https://forums.unrealengine.com/t/how-can-i-fix-module-validation-failed/1176251)  
and  
[Verify your UEFN installation on Windows 11 using Epic Games Launcher as “Run Administrator”](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

The problem concerns Windows 11 Extended Security blocking parts of the UEFN installation update.

This seems to happen on Windows 11 and most UEFN updates since 30.00.  
Most problems with UEFN and Windows 11 can be fixed by Verify of UEFN