HLOD does not build. It says "build failed"

When trying to build HLODs via the Build > Build HLODs button, I get the error “Build Failed!”

This is the same on multiple projects with and without URC, and the same for other members on my team.

We have world streaming enabled, other than that I am not sure why it would not work.

Thank you

(Unable to upload logs, file to big even when compressed - I can message anyone logs if needed)

Hey @KyleDev, can you message me the logs please? I can take a look. Thanks!

Thanks @KyleDev for sending the logs. This is a known issue that should be fixed in the next release.

Awesome, thank you very much!

Did you ever get this fixed? I’m getting the same thing currently and can’t seem to find anything in the message or output logs and can’t seem to find any log files in /documents/

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I’ve had the same problem in UE5.2 for some time now

is there a solution to this?

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Hello,

A common fix is to disable Virtual Texture from project settings before build. You can enable it back after the build is done.

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Hi Logan, do you know if this is slated for UE 5.3? Looks to have been pushed to UE 5.4, this currently breaks our game and is stopping us from maintaining our October release schedule as it was previously working for us in UE 5.1.

Testing turning off VTs worked in the smaller default WP map but in our own maps resulted in the build failing due to the page file running out of memory.

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Hi Mark, we already pushed a fix for a LOD building error before. Could you reproduce the issue and send me the new log in a DM so I can investigate further? Thanks!

HLODs wont build on our island either

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Hi @X_TyFighter_X, could you please reproduce the HLOD build failure issue, close UEFN, then send me the logs in a DM so I can investigate? Thanks!

It just never builds, was still on 1% after 2.5 hours. Which logs are you after? It does sometimes fail I think rather than get stuck but happy to grab what i can

Hi Logan,

My apologies, I only just noticed this was UEFN and not UE 5.2, sounds like its fixed in UEFN but not the main Unreal Engine for us Devs!

Do you know if there is someone on that side I could send the logs to?

EDIT: The problem still exists in UE 5.3 as well

M

I was able to fix my problem.

I searched the “logs” for a long time and looked closely at all the messages, including the warning.

I found an object that references an external object that is causing a problem.

I found the external object on the map and deleted it.

Since then the error no longer occurs.

I have a similar issue and it seems like this asset is causing the problem: ExternalActors/1_BP/MenuLevel/Menu_Level_WP/5/NA/GV09B5Z9UBTUE247899DUA.uasset
How did you go about finding which actor that acutally is? Might be a silly question, but maybe you can help me

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BUMP! We just hit this same issue, one of the ExternalActors file is causing the issue and the project will not validate or launch in Fortnite, How do we fix this issue please.

Hey, right click on your HLOD file in the Content Browser and Validate Assets and dependencies.

I had the usual non spatially loaded stuff as children of spatially loaded stuff and vice versa.
But I also found a material I was using, an instance of the CR_DamageOverlay material is no longer valid, I had to change it out

what did the message look like

Did you ever figure this out?