Summary
HLOD build fails consistently with a crash (WorldPartitionHLODsBuilder) despite project functioning normally otherwise.
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Other
Steps to Reproduce
Open project in UEFN
Project loads normally
Attempt to Build HLODs or Delete HLODs
Build process starts
Editor crashes during HLOD build process
Expected Result
HLODs should build successfully without crashing, allowing the project to be optimized and published.
Observed Result
-HLOD build always fails
-WorldPartitionHLODsBuilder returns code 3
-Crash with EXCEPTION_ACCESS_VIOLATION
-ShaderCompileWorker crashes during build
-Error: ias.cache.0.jrn being used by another process
-Project itself still opens, plays, and sessions launch normally.
Platform(s)
Windows PC
Island Code
3002-9262-6738
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Additional Notes
I’ve already attempted fixing redirectors, replacing HLOD layers, removing broken external actors, and clearing cache (Saved/Intermediate/ias), but the issue persists.
HLOD build fails due to IAS journal file (ias.cache.0.jrn) already being held by the main UnrealEditorFortnite process itself. Confirmed via Resource Monitor — no external process involved. Leads to cache initialization failure and EXCEPTION_ACCESS_VIOLATION during WorldPartitionHLODsBuilder.