Persisting Adaptertask object

Hi!
I am trying to create an Adaptertask object (You can find the object under com.ibm.rqm.xml.bind in the source code for RQM-Copyutil) I initialise that object,(See code, I am using a method to create the object createAdapterTask) making sure I have all the necessary fields. When I am persisting the object, therefore using the RQMRestClient Object I am doing the following:

RQMRestClient  RQMRClient = = new RQMRestClient("https",<host<,<Port>,<ProjectArea>,"jazz");



//Other code to make sure I connect using username and pwd

..

..



try {

			

			Adaptertask adapter = this.createAdapterTask();

			RQMRClient.putArtifact("tasks", "59234",adapter);

			

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (JAXBException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (RestException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

Everytime I run the above code I get an 500 HTTP error (which means that an internal error occurred in the server.
Is it the type of task I am putting as fields ("tasks")? Or is it something that changed in the RQM 3.0.1.1 regarding this object?

thank you all for your time.