VERSE_DEAD in scene graph workflow keeps crashing the editor on project launch

General Issues and Bug Reporting
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1

Summary

It appears that when having some components referencing some entities in the scene and then attempting to rename editable fields as well as remove some one can eventually trap into a VERSE_DEAD issue that will keep the editor crashing. Such editor behavior is way too aggressive, the editor should never crash.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

This is not trivial, please check recently sent crash logs.

Try creating some editable entity reference in components, assemble them in the outliner, then start renaming and removing such editable from the component as part of a refactoring flow and keep compiling the project.

Expected Result

The editor should not crash. We should be able to compile the project and at least get error messages that indicate where the issue is that the editor dislikes.

Observed Result

...
Script error 9000: SolarisRuntime is provided with a set of new link tasks, but a previous link task did not complete successfully: Unable to import resolve '/path_to_a_prefab_component_C'.
...
VerseBuild: Error: path_to_project_component.verse(...): Script error 9000: SolarisRuntime is provided with a set of new link tasks, but a previous link task did not complete successfully: Unable to assemble '/Engine/Transient.VERSE_DEAD_some_project_component_1'.
...
LogWindows: Error: appError called: Fatal error: [File:Z:\UEVFS\Root\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp] [Line: 305] 
Renaming an object (VerseStruct /Engine/Transient.VERSE_DEAD_tuple_L_R_2) on top of an existing object (VerseStruct /Engine/Transient.tuple_L_R) is not allowed

Platform(s)

UEFN

Additional Notes

Crash logs cannot be attached here due to private date protection. Logs were uploaded automatically UECC-Windows-D9470FBB437F2573071AC0BE524D8E09_0001.

2

CC @Flak, if scene graph issues are important, someone from the SG team should take a long and reproduce this as this issue is not really forgiving on the developers.

8

If you’re experiencing crashes related to VERSE_DEAD in the scene graph workflow, try verifying your project files and checking for any incompatible plugins. Updating Unreal Engine to the latest version may also help. Additionally, clearing cached data can sometimes resolve unexpected crashes. Let me know if you need further assistance.

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9

The editor should never crash though. I managed to resolve the issue, but it should never happen.

I stashed my code changes in my git client, launched the project successfully again, re-applied the stashed changes, looked up all pre-placed prefabs and manually unlinked all editable fields that would have been affected by the code changes. Only then compiling the project hasn’t killed the editor.

Neither is my plugin incompatible in any manner, nor am I aware of any workflow to verify the files when the editor is simply crashing on project launch. UEFN is always up to date, this step isn’t really applicable. Not sure what kind cached data you are referring to and where they are located.

This smells like an unhandled editor flow and should be addressed on the engine level.

12

FORT-871963 has been ‘Closed’ as a duplicate of an existing known issue.