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Hi I am trying to publish the vcm content through API.

This is the code i am trying with

ContentInstance contentInstance = (ContentInstance)ciIteratorCar.next();

ManagedObjectVCMRef mobj = new ManagedObjectVCMRef(contentInstance);

SiteRef siteref = new SiteRef();

Site site = Site.findByName("usen");

site.addDeployableObject(guid);

DeploymentClient deploymentClient = new DeploymentClient(siteref);

deploymentClient.launchJob(mobj.getObjectId());

 But I am getting run time exception. Can you plz help me?