B4X FEED Error build standalone file

[practicalsoft]

My used libraries are :
Private j As jGetMac
Private hook As NativeHook
Public Robot_ As AWTRobot
Private keycodes As JavaObject
Private mqtt_ As MQTT
Private socket_ As ServerSocket

Also:
#if java
import com.sun.javafx.robot.*;
import javafx.scene.Scene;
public static Object newRobot(Scene s){
FXRobot robot = FXRobotFactory.createRobot(s);
return robot;
}
#End If
#end region

I try to build a standalone package but have an error:
src\b4j\example\main.java:4: error: package javafx.scene does not exist
import javafx.scene.Scene;
^

My java version is 11 and is OpenJDK
I don't have an error in java 8

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