[jboss-user] [JBoss jBPM] - Exception when I start a TaskInstance

[tangomannn]

Hi, and getting a org.hibernate.HibernateException: null index column for collection: org.jbpm.graph.exe.ProcessInstance.instances   EXception in the moment I start a Taskinstance  (TaskIntance.start() ).  
The task instance has already the actor set, and everything seems to be well, but, when I start it, it throws the exception.
Any Idea, or clue?
Thanks in advance
Fernando
The code:
protected void executeFirsTask(){
  | 		JbpmContext ctx = JbpmConfiguration.getInstance().createJbpmContext();
  | 		try{
  | 			List<TaskInstance>  tasks = ctx.getTaskMgmtSession().findTaskInstances(getUsername());
  | 			
  | 			if (tasks!=null && tasks.size() >0){
  | 				TaskInstance ti =tasks.remove(0);
  | 				ti.start(); //HERE Throws the ExceptioN!
  | 				ti.end();
  | 				ctx.save(ti);
  | 			}
  | 		}finally{
  | 			ctx.close();
  | 		}
  | 	}




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