I just started working with JavaFX. I know how the basics of it work. I tried to use the media and the mediaplayer classes to play a sound, called "sound.mp3". I am programming in eclipse, and I have the sound file in the src folder, the same folder as "(default package)". Here is my code:

```
import javafx.scene.media.*;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");

        String ssound = "sound.mp3";
        Media sound = new Media(ssound);
        MediaPlayer mediaPlayer = new MediaPlayer(sound);
        mediaPlayer.play();

        StackPane root = new StackPane();
        primaryStage.setScene(new Scene(root, 800, 450));
        primaryStage.show();
    }
}

```

Please tell me what I'm doing wrong.

Here is the error message thing from the console:

```
Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.access$000(Unknown Source)
    at com.sun.javafx.application.LauncherImpl$1.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:724) Caused by: java.lang.IllegalArgumentException: uri.getScheme() == null!
    at com.sun.media.jfxmedia.locator.Locator.<init>(Unknown Source)
    at javafx.scene.media.Media.<init>(Unknown Source)
    at Main.start(Main.java:16)
    at com.sun.javafx.application.LauncherImpl$5.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$5.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$4$1.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl$4$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$4.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
    at com.sun.glass.ui.win.WinApplication$3$1.run(Unknown Source) ... 1 more

```