What does this (world partition?) error / warning mean and how can i fix it?

Development World Creation
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Here’s the full warning:

AttachTo: ‘/Memory/UEDPIE_0_MainGrid_L2_X-1_Y0_DL0.OpenWorldMap:PersistentLevel.SkeletalMeshActor_UAID_7085C249EF13404F01_1983144855.SkeletalMeshComponent0’ is not static , cannot attach ‘/Memory/UEDPIE_0_MainGrid_L2_X-1_Y0_DL0.OpenWorldMap:PersistentLevel.StaticMeshActor_UAID_7085C249EF13814F01_2012365287.StaticMeshComponent0’ which is static to it. Aborting.