Not able to fix my error

package com.example.testingmedia;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import java.io.File;
import java.io.IOException;

public class HelloApplication extends Application {
    @Override
    public void start(Stage stage) throws IOException {
        FXMLLoader fxmlLoader = new FXMLLoader(HelloApplication.class.getResource("hello-view.fxml"));
        Scene scene = new Scene(fxmlLoader.load(), 320, 240);
        stage.setTitle("Hello!");
        stage.setScene(scene);
        stage.show();

        String file = "https://www.youtube.com/watch?v=rcp3tZ3XFyQ";
        Media media = new Media(new File(file).toURI().toString());
        MediaPlayer mediaPlayer = new MediaPlayer(media);
        MediaView mediaView = new MediaView(mediaPlayer);

        Button button1 = new Button("Play");
        Button button2 = new Button("Pause");
        Button button3 = new Button("Stop");

        button1.setOnAction(e -> {
            mediaPlayer.play();
        });

        button2.setOnAction(event -> {
            mediaPlayer.stop();
        });

        button3.setOnAction(event -> {
            mediaPlayer.stop();
        });

        GridPane layout = new GridPane();
        layout.setHgap(10);
        layout.setVgap(10);

        //layout.add(mediaView, 0, 0);
        layout.add(mediaView, 1, 0);
        layout.add(button1, 0, 1);
        layout.add(button2, 1, 1);
        layout.add(button3, 2, 1);

        Scene scene1 = new Scene(layout, 300, 200);

        stage.setTitle("Coding a MediaView");
        stage.setScene(scene);
        stage.show();
    }

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