What is this error about?

Development Programming & Scripting
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Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 1067]
Array index out of bounds: 1 into an array of size 1

UnrealEditor_Core
UnrealEditor_Engine
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Renderer
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll

2

Hello there @Sagittarius22!

The error you are getting sounds like UE is having trouble accesing an element in an array, either because it’s corrupted, or it doesn’t exist. The problem is, that there are multiple causes for this type of behaviour.

When do you get this crash? Are you able to open your project, or does it fail on load? Or does it happen when manipulating a certain asset?

From what we have now, I can only suggest a cache clear to rule out corruption. Close your project, go to it’s main directory, and delete folders Saved, Intermediate, and DerivedDataCache. After that, re-open the project, and allow it to rebuild.

I would also suggest clearing up your current GPU driver install using DDU, then installing the latest set of drivers. If you are on nVidia, please test the Studio Drivers.

3

Hey thanks for the response!

This usually occurs on several occasions like when I am navigating to a certain part of a map, or switching between levels both from persistent level(level tab) or opening a different level entirely but this happens rarly. sometimes its random.

Only fix that I finds that works is by deleting my PLA actor folders which contains both PLAs and BPs from the directory itself and open the project let it load then close it and then agian undo those deletes to get my PLAs and BPs back.