UE5 Collision Error ?

I´m currently working on a small game with a turn based combat system. Lately an Error drives me crazy and causes the whole system to fail.

Attach to: `/Game/LeveBP/UEDPIE_0_Level_2_:PersistentLevel.PartyUnitBase_C_0.CollisionCylinder cannot be attached to itself. Aborting.

PartyUnitBase is the playable characters in Game. Same Error shows up for Enemy Units. I think CollisionCylinder refers to the capsule component?

I have absolutly no idea, whats causing that problem. Maybe someone can help me?