Can't use onScoreStateChanged

Hello,

I'm trying to use a basic listener/event in my main PluginAPI class named Musescore but I can't even execute cause of : "ligne 20: Cannot assign to non-existent property "onScoreStateChanged""
But on the Doxygen documentation, every PluginAPI object seems to have this property.
And also, the code I'm trying is the basic "selectionChangeExample" plugin...
I'm not a QML/Qt pro, so please someone can help me ? Here is the code :


import QtQuick 2.0
import MuseScore 3.0
MuseScore {
menuPath: "Plugins.selectionChangeExample"
pluginType: "dock"
dockArea: "left"
implicitHeight: 75 // necessary for dock widget to appear with nonzero height
implicitWidth: 150

Text {
// A label which will display pitch of the currently selected note
id: pitchLabel
anchors.fill: parent
}
onRun: {
console.log(this);
console.log(Object.keys(this));
}
curScore.onScoreStateChanged: {
if (state.selectionChanged) {
var el = curScore ? curScore.selection.elements[0] : null;
if (el && el.type == Element.NOTE)
pitchLabel.text = el.pitch;
else
pitchLabel.text = "no note selected";
}
}
}