AnimatedSprite onFinished error: cannot assign to non-existent property "onFinished"

Code snippet (used with Felgo).

AnimatedSprite {
id: game_met_e_ship
height: 100
width: 100
loops: 1
anchors.centerIn: parent
currentFrame: 0
running: true
frameCount: 6
frameWidth: 800
frameHeight: 801
z: 201
frameRate: 10
source: "../../assets/electric.png"
onFinished:

}