Threading problems

Hi,

Does anyone know why this code yields a "cannot activate openGL context"
error?

import com.cyberbotics.webots.Controller;
public abstract class Judoka0 extends Controller {
    static int camera;

    public static void reset() {
        camera = robot_get_device("camera");
    }

    public static void main() {
        camera_enable(camera, 64);

        Sensors sensors = new Sensors();
        sensors.setPriority(Thread.MIN_PRIORITY);
        sensors.start();

        while(true)
            robot_step(64);
    }

    static class Sensors extends Thread {
         public void run() {
            while(true) {
                int[] img = camera_get_image(camera);
                try {
                    thread.sleep(200);
                }
                catch(Exception e){}
            }
        }
    }
}

Best regards,
Anders.L





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