Unable to Open Project after HLODS Build's Fail

Summary

I’ve had problems building the HLODS on this island since the beginning: every time I tried to build them, I got a Fail error with a pop-up. I found a solution: changing the Cell Size and Loading Range of both the HLODS and the island’s Main Partition, allowing me to build them at least once (it didn’t work with multiple builds).

I recently tried building them again using the temporary fix listed above, but the UEFN editor crashed. I tried opening it again without success, and now it won’t open anymore. It always crashes at around 72%, while ‘‘uploading plugins’’. I’ll give the relative HLODS fail’s log and Crash log in the comments.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

  • Try to build HLODS

Expected Result

HLODs should build successfully

Observed Result

I Always receive bunch of warnings and errors in the Output Log after trying or in some cases successfully build the HLODS. Now I’m unable to open the project after a crash due to HLODS build’s fail.

Platform(s)

PC

HLODS FAIL:

WorldPartitionHLODsBuilder-00004544-2026-01-27T12.18.14.407Z.rar (98.4 KB)

CRASH:

UnrealEditorFortnite.rar (111.3 KB)

hi @Majorrblues ,

The log before the crash says

[2026.01.27-13.53.31:076][926]LogAssetRegistry: Error: Package is unloadable: C:/Users/oibaf/Documents/Fortnite Projects/trying/Content/ExternalActors/trying/5/W2/B781WPOXYARM192MNVYO98.uasset.

Reason: Invalid value for PACKAGE_FILE_TAG at start of file.

Try putting B781WPOXYARM192MNVYO98 search box of the Asset box to find the asset then delete this

The alternative is Win File explorer and find the asset above and delete the asset

The probable cause is the dimensions are not the power of two

Document Resizing Textures contains error 512 is not a Power Of 2 - General / Issues and Bug Reporting - Epic Developer Community Forums

Hello,

I tried to delete the file in the Project’s folder (since I can’t access the project from the editor) with no luck, still crashes at 72% while Loading Plugins.