Hello, I tried following the spine-ue4 playlist to Set Animation node and it worked fine in play mode.
But when I tried to save the level, I got this error and could not save my level.

Can't save E:/Unreal Projects HDD/TestPlugin/Content/TestSpine03.umap: Graph is linked to external private object BodySetup /Game/Spine02/OwlActor_Blueprint.OwlActor_Blueprint_C:SpineSkeletonRenderer_GEN_VARIABLE.BodySetup_0 (ProcMeshBodySetup)

I use spine export files in folder example from spine git and import it to blank c++ project in UE5.3.2
How should I fix this?

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Found the solution >>
It happened when I tried to convert Actor to Actor blueprint in that level. So just delete that actor in level and drag the actor from content browser instead.
Or just create actor blueprint from content browser to avoid this problem.