Exception in thread "Thread-1" java.lang.NullPointerException
at de.nec.nle.siafu.testland.AgentModel.run(AgentModel.java:227)
at java.lang.Thread.run(Thread.java:744)

public void run() {
    double delay = getDelay();
    Agent alice = getAlice();


    Place p1 = null;
    Place p2 = null;

    try {
        Thread.sleep((long)(delay/2));
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    try {
        p1 = world.getNearestPlaceOfType("parking", alice.getPos());
    } catch (PlaceTypeUndefinedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    try {
        Thread.sleep((long)(delay/2));
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    try {
        p2 = world.getNearestPlaceOfType("parking", alice.getPos());
    } catch (PlaceTypeUndefinedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

AgentModel agm = new AgentModel(world);
        Thread thr1 = new Thread(agm);
        thr1.start();

public AgentModel(final World world)