i want to make a animation play one time and don't play again. How i do that?
Let the message set a property to value 1. Then add a property sensor: If property = 1 --> play action.
Let the message set the state with the "State" actuator. In the another state, play the action triggered by an always sensor.
It will never play again ;)
I see you wrote "Vanish". If you want that the object disappears, use the "Invisibility"-Actuator instead of an action actuator and turn "Visible" off.