im getting an error saying " Outdated HLODs detected, HLODs need to be rebuilt" how do i rebuild them im new to unreal engine

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Hey @TYRCGC Have you had a look at the documentation for HLOD’s?
Building Hierarchical Level of Detail Meshes in Unreal Engine | Unreal Engine 5.7 Documentation | Epic Developer Community
Hierarchical Level of Detail Outliner in Unreal Engine | Unreal Engine 5.7 Documentation | Epic Developer Community

Essentially, open the HLOD Outliner, hit Generate Clusters, check the piles, tidy the settings if they look wonky, then run your proxy meshes. Save the level so you do not have a meltdown later.

If you want the executive shortcut, go to Build then Build HLODs and let Unreal crunch everything for you.

Any time you shuffle actors or reshape the level, your HLODs get stale. Rebuild after big edits, tune the cluster settings to keep things disciplined, and use HLOD Volumes when you want absolute control of the floor plan.