Marte Engine ParticlesEntity not working

[sspitfire]

Hi all. I know Marte Engine is discontinued but I already started a project with it and its too late for me to switch to another engine before I finish this project. My question is about the ParticlesEntity class - I create a class that extends it and then I add the entity in the level World but its not showing anywhere. Do I have to use the old way to build particle systems like in slick2d?
here is my code:

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public class Effect extends ParticlesEntity { public Effect(float x, float y, Image particle, ConfigurableEmitter emitter) {       super(x, y, particle, emitter);       // TODO Auto-generated constructor stub       this.depth = 150;    }    @Override    public void update(GameContainer container, int delta)          throws SlickException {       // TODO Auto-generated method stub       super.update(container, delta);    }    @Override    public void render(GameContainer container, Graphics g)          throws SlickException {       // TODO Auto-generated method stub       super.render(container, g);          } } ========= in the level class (extends World)================= // PARTICLES             File xmlFile = new File("data/healing.xml");       try {          ConfigurableEmitter emitter = ParticleIO.loadEmitter(xmlFile);          emitter.setEnabled(true);                 } catch (IOException e) {          // TODO Auto-generated catch block          e.printStackTrace();          System.out.println("particle config  file not found/ cant be accessed");       }       particle = new Image("data/plus.png");       add(new Effect(200, 200, particle, emitter));