I've the next code:

Code:

import processing.video.*;
import jp.nyatla.nyar4psg.*;
import processing.opengl.*;
import processing.core.*;


public class prueba extends PApplet {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private final String CARCODE_FILE = "/resources/data/1.patt";
	private final String PARAM_FILE = "/resources/data/camera_para.dat";

	Capture cam;
	NyARBoard nya;
	PFont font;

	public void setup() {
		//size(640, 480, OPENGL);
		size(640, 480);
		colorMode(RGB, 100);
		font = createFont("FFScala", 32);

		cam = new Capture(this, width, height);

		// Left hand projection matrix
		nya = new NyARBoard(this, this.width, this.height, "camera_para.dat", "1.patt",80);
		
		// //Right hand projection matrix
		
		//nya = new NyARBoard(this,width,height,"camera_para.dat","patt.hiro",80,NyARBoard.CS_RIGHT);
		print(nya.VERSION);
		nya.gsThreshold = 120; // (0<n<255) default=110
		nya.cfThreshold = 0.4;// (0.0<n<1.0) default=0.4
		// nya.lostDelay=10;//(0<n) default=10

	}

	void drawMarkerPos(int[][] points) {
		
		//textFont(font, 10.0);
		stroke(100, 0, 0);
		fill(100, 0, 0);
		for (int i = 0; i < 4; i++) {
			ellipse(nya.pos2d[i][0], nya.pos2d[i][1], 5, 5);
		}
		fill(0, 0, 0);
		for (int i = 0; i < 4; i++) {
			text("(" + nya.pos2d[i][0] + "," + nya.pos2d[i][1] + ")",
					nya.pos2d[i][0], nya.pos2d[i][1]);
		}
	}

	String angle2text(float a) {
		int i = (int) degrees(a);
		i = (i > 0 ? i : i + 360);
		return (i < 100 ? "  " : i < 10 ? " " : "") + Integer.toString(i);
	}

	String trans2text(float i) {
		return (i < 100 ? "  " : i < 10 ? " " : "") + Integer.toString((int) i);
	}

	public void draw() {
		  background(255);
		  if (cam.available() !=true) {
		    return;
		  }
		  cam.read();
		  
		  image(cam,0,0);

		  
		  if(nya.detect(cam)){
		    
		    //textFont(font,25.0);
		    fill((int)((1.0-nya.confidence)*100),(int)(nya.confidence*100),0);
		    text((int)(nya.confidence*100)+"%",width-60,height-20);
		    
		    pushMatrix();
		    //textFont(font,10.0);
		    fill(0,100,0,80);
		    translate((nya.pos2d[0][0]+nya.pos2d[1][0]+nya.pos2d[2][0]+nya.pos2d[3][0])/4+50,(nya.pos2d[0][1]+nya.pos2d[1][1]+nya.pos2d[2][1]+nya.pos2d[3][1])/4+50);
		    text("TRANS "+trans2text(nya.trans.x)+","+trans2text(nya.trans.y)+","+trans2text(nya.trans.z),0,0);
		    text("ANGLE "+angle2text(nya.angle.x)+","+angle2text(nya.angle.y)+","+angle2text(nya.angle.z),0,15);
		    popMatrix();    
		    
		    drawMarkerPos(nya.pos2d);
		    
		    //PGraphicsOpenGL pgl = new PGraphicsOpenGL();
			    
		    PGraphicsOpenGL pgl =	((PGraphicsOpenGL) g);
		    
		    nya.beginTransform(pgl);
		    
		    stroke(255,200,0);
		    translate(0,0,20);
		    box(40);
		    nya.endTransform();
		  }
	}

	public static void main(String args[]) {
		// PApplet.main(new String[]
		// {"com.jarventure.client.graphics3D.prueba"});

		new prueba().setVisible(true);

	}
} 

And the next error occur:

NyAR4psg/0.2.2;NyARToolkit for java/2.2.0;ARToolKit/2.72.1Exception in thread "Animation Thread" java.lang.ClassCastException: processing.core.PGraphicsJava2D cannot be cast to processing.opengl.PGraphicsOpenGL
     at com.jarventure.client.graphics3D.prueba.draw(prueba.java:97)
     at processing.core.PApplet.handleDraw(Unknown Source)
     at processing.core.PApplet.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)


Some Idea??'

Thx