Event kann nur links von += oder -= stehen (es sei denn, es wird innerhalb des Typs "EventOriginScript" verwendet)

[GentleMoa]

This problem appears when trying to trigger an event that was initialized inside the "GameManager" class as a "public event Action" from another class. In another class you can only subscribe / unsubscribe function to / from that event but you cannot trigger the event itself.

--> This means that all the conditions need be to checked in the GameManager script and then the event is triggered there.