Troubleshooting

When something looks off, start here.

"Can't find class descriptor" warnings in a World Partition map

Symptom: loading (or packaging) a World Partition level logs warnings like LogWorldPartition: Can't find class descriptor ... using '/Script/Engine.Actor' naming a PVLK Blueprint.

Cause: the map still contains actors placed from a Blueprint that has since been deleted or renamed. World Partition stores every actor as its own file, so the orphans quietly stay on disk and warn on every load. This is standard engine behavior for any deleted Blueprint class — no other data is affected.

Fix:

  1. Open the map and type the light's name (or just PVLK) in the Outliner search box.
  2. The orphans appear as plain Actor entries with long auto-generated names. Select and delete them.
  3. Save the level. The warnings are gone on next load and next package.
Rule of thumb: delete the placed lights before deleting a light Blueprint you no longer want.

Properties are greyed out on the light component

Intentional — those settings are driven by the PVLK Light Settings category on the actor, and the component shows them read-only so the two can never disagree. Hover the property for a tooltip. On your own Blueprints using the PVLK light components directly, everything stays editable. Details in the FAQ.

Runtime changes don't do anything

Three things to check, in order:

  1. Mobility: Static lights are baked; Unreal ignores runtime changes to them. Use Movable (or Stationary for color/intensity).
  2. The update call: after setting a PVLK actor property from Blueprint, call its Update...Settings function to apply it.
  3. The right target: on a PVLK actor, set the actor's PVLK properties, not the component's.

The icon changed when I changed mobility

That's a feature: PVLK lights show a different editor icon for Movable lights so you can read your lighting setup at a glance — the same convention as Unreal's built-in lights. Set a Custom Icon Texture on the light if you want one icon regardless of mobility.

The preset dropdowns are empty

The dropdowns list preset data assets. If you deleted the shipped presets (or filtered your Content Browser), create new ones: right-click in the Content Browser → Miscellaneous → Data Asset → PVLK Light Preset. New presets appear in the panel automatically.

Something else?

Email MystikonStudios@yahoo.com with your engine version, what you clicked, and what you expected — screenshots welcome.