SpawnSystem call references a deleted Niagara System

Why: Your spawn-system node points at the Niagara asset '{sys}' which no longer exists in the project.

Fix: In Content Browser, search for Niagara assets to confirm whether '{sys}' is missing. If you can rename: drag the actual existing system onto the node's pin. If missing entirely: replace the call with a different VFX or temporarily disconnect until you create the system.