JavaFX-Error "error: cannot find symbol import javafx.scene.Media"

Question

(Sorry, by mistake I've deleted the old version of this post. Despite of following the advices, the problem is still there.)

(If my question isn't good or acceptable, I would appreciate to know why! Thanks!)

Hi! I'm using IntelliJ with Gradle, and I am following some udemy-tutorial. Please, could you help me with that problem? I've been googling on that for hours. Thanks a lot! (Please don't be to severe with me. I'm a beginner both in java and on StackOverFlow (and in the English language) :)

All the best, M.I.

My code:

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Media;
import javafx.scene.media.MediaPlayer;

import java.net.URL;

public class SnakeGame extends Application {

    private MediaPlayer mediaPlayer;

    @Override
    public void start(Stage primaryStage) throws Exception {
        String musicFile = "snakeMusic.mp3";
        URL fileUrl = getClass().getResource(musicFile);
        System.out.println(fileUrl);
        Media media = new Media(fileUrl.toString());
        mediaPlayer = new MediaPlayer(media);

    }

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

My error:

/Users/magisterinformaticus/MySnake/src/main/java/SnakeGame.java:44: error: cannot find symbol
import javafx.scene.Media;
                   ^
  symbol:   class Media
  location: package javafx.scene 

My build.gradle:

plugins {
    id 'java'
    // add
    id 'application'
    id 'org.openjfx.javafxplugin' version '0.0.8'
}

// add
mainClassName = 'SnakeGame'

group 'org.example'
version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

javafx {
    version = "11"
    modules = [ 'javafx.controls', 'javafx.fxml', 'javafx.media']
}