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unable to build lighting, swarm failed?

Does anyone have any ideas of what to do with this error?

Begin Map
Begin Level
Begin Actor Class=StaticMeshActor Name=deco_windows_panel_d3 Archetype=StaticMeshActor’/Script/Engine.Default__StaticMeshActor’
Begin Object Class=StaticMeshComponent Name=“StaticMeshComponent0” Archetype=StaticMeshComponent’Default__StaticMeshActor:StaticMeshComponent0’
End Object
Begin Object Name=“StaticMeshComponent0”
StaticMesh=StaticMesh’/Game/ModularBuildingSet/Meshes/Building_Deco/deco_windows_panel_d.deco_windows_panel_d’
StaticMeshDerivedDataKey=“STATICMESH_46A8778361B442A9523C54440EA1E9D_2C1BC8F50A7A43818AFE266EB43D9060_B88AB03D452CEB605FB7C490D3B37B580000000001000000010000000100000000000000000000004000000000000000010000000000C03F0000C03F0000C03F0000803F000000000000803F00000000000000000000344203030300000000”
BodyInstance=(MassInKg=52.554535)
RelativeLocation=(X=7291.000000,Y=-29645.000000,Z=745.000000)
End Object
StaticMeshComponent=StaticMeshComponent0
RootComponent=StaticMeshComponent0
ActorLabel=“deco_windows_panel_d3”
End Actor
End Level
Begin Surface
End Surface
End Map

I fear we’re going to need more infos about your scene, settings!!! post screenshots if you can!

Check the Lightmass settings of “deco_windows_panel_d” and the actor “deco_windows_panel_d3” I’ve experienced problems with lighting builds failing when I accidentally set the light map size to 3264 (instead of changing it from 32 to 64)