# Cook Failure outputsentry.failed

**URL:** <https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, closed, UEFN, fortnite, Cooking-Failed\
**Created:** [July 30, 2025, 6:56am UTC](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456 "2025-07-30T06:56:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Pokeasy](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/pokeasy/32/1215761_2.png) [@Pokeasy](https://forums.unrealengine.com/u/Pokeasy)\
**Post date:** [July 30, 2025, 6:56am UTC](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456/1 "2025-07-30T06:56:31Z")

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### Summary

When I click the “Launch Session” button in UEFN, it shows this cook error “outputsentry.failed”

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Other

### Steps to Reproduce

Launch Session it shows this cook error “outputsentry.failed”

### Expected Result

Launch Session successfully launches a Session but fails with cook error

### Observed Result

outputsentry.failed cook error

### Platform(s)

PC

### Upload an image

 ![image.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/1/d/21d7c5c783676a8d9762a300a50b56e1cb2a5236.png)

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<div class="post-metadata">

**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\
**Post date:** [July 30, 2025, 11:24am UTC](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456/3 "2025-07-30T11:24:23Z")

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FORT-944750 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.

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<div class="post-metadata">

**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\
**Post date:** [August 13, 2025, 5:45pm UTC](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456/5 "2025-08-13T17:45:38Z")

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FORT-944749 has been ‘Closed’. We’re unable to reproduce this issue.

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<div class="post-metadata">

**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [January 26, 2026, 6:57am UTC](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456/6 "2026-01-26T06:57:27Z")

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