Marte Engine ParticlesEntity not working

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:


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));