Exception in thread "main" java.lang.NullPointerException

package a;

import java.io.IOException;
import java.util.*;

import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceFactoryImpl;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import Protocol.*;


import org.eclipse.core.resources.ResourcesPlugin;

public class mai {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
		
		ProtocolPackage model = ProtocolPackage.eINSTANCE;
		
		// Create a resource set.
		ResourceSet resourceSet = new ResourceSetImpl();
		resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("Protocol", new XMIResourceFactoryImpl());
		
		
		// Get the URI of the model file.
		URI uri = URI.createURI("file:/C:/runtime-New_configuration/aaaa/My3.protocol");
		
		// Create a resource for this file.
		Resource resource = resourceSet.createResource(uri);
	        resource.load(null);


		// Try if the metamodel imported correctly 
		Systeme s = (Systeme)resource.getContents().get(0);
		EList<Template> list =s.getTemplates();
		Iterator i = list.iterator();
		while (i.hasNext())
			java.lang.System.out.println(((Template)i.next()).getName());
		java.lang.System.out.println(s.getNom());
		
		//return f;
		}
		
		catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		//System.out.println(f);
		
		
	}

}