[Swarm-Support] swarm

[Gregoire Boutonnet]

Hi,

I program in java language.
I have read the tutorial and I try to make a programme but I have an error that 
I can`t correct.

I explain my trouble :
I have a file "ModelSwarm.java" in which I have written the fonction 
"activateIn(Swarm swarmContext)"

the code is :

 public Activity activateIn(Swarm swarmContext)
    {
        // Use the parent class to activate ourselves in the context passed to 
us
        super.activateIn(swarmContext);

        // Then activate the schedule in ourselves
        modelSchedule.activateIn(this);     // line 172 of ModelSwarm.java

        // Finally return the activity we have built
        return getActivity();

    }

Like in heatBugs

and in another file "StartSimulation.java" I call this method : 
modelSwarm.activateIn(null); (line 31)
This request is in the main method.

When I compile I have no error
But when I want to run the program I have this error :

Exception in thread "main" java.lang.NullPointerException
        at ModelSwarm.activateIn(ModelSwarm.java:172)
        at StartSimulation.main(StartSimulation.java:31)

And I don`t understand why.
Maybe can you help me.

Thanks a lot
Regards

BOUTONNET Gregoire