Unable to launch a session : "We hit an error while cooking this content errors.com.epicgames.content-service.cook_failure"

General Issues and Bug Reporting
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Summary

Since the update 35.20, I’m unable to launch a session or build a private code of my island.

The session, start but after the project has been send, I get the error in the screenshot attached to this post.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Launch a session

Expected Result

Session start without error

Observed Result

The session start but with an error

Platform(s)

Tried on PC, Xbox, Xbox cloud and Luna

Upload an image

Screenshot 2025-06-08 at 14.48.16.png
Screenshot 2025-06-08 at 14.48.16.png2402×242 88.2 KB

Additional Notes

When I try to launch the session, before I was getting an other error already post here : Validation error from outdated files in sys/versions (regression?)

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Here is the log file of UEFN for the last session I tried to launch:
UnrealEditorFortnite - Copy.log (6.4 MB)

2 Likes
3

FORT-920755 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.

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I think the issue is related to the error pointed out here: Validation error from outdated files in sys/versions (regression?) - #42 by sonictke

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@nicoplv Just to double-check, are you all good here, or are you saying that this is a different issue you’re still running into?

1 Like
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I AM HAVING THE SAME ISSUE IS THERE ANY WAY TO FIX IT

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Everythink is good now, thank you.
The issue was:

using {UMG}
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Hi @REVO_RUSH, could you please provide more details and copy/paste the exact error message you’re seeing here? Thanks.