Warning : None of them were set as the actor's RootComponent

Development Programming & Scripting Blueprint
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I ’ m getting this warnings when try to compile Parent" Master Part".

LogActor: Warning: Part_Engine_C /Engine/Transient.World_29:PersistentLevel.TestEndine_GEN_VARIABLE_TestEndine_C_CAT_1 has natively added scene component(s), but none of them were set as the actor's RootComponent - picking one arbitrarily

Getting this warnings from all Master_Part’s children.

And the BP looks like that :

238309-screen.jpg
238309-screen.jpg2517×733 360 KB

And i dont know if its important but compiling this BP takes about 1-2 mins with I9 CPU and 32 GB ram.

Any idea how to fix that,
Thanks .