I am getting one exception as : No SuchMethod Exception session.startProcess(Ljava.lang.String) when i executing the following code in one of the class :

public static StatefulSession getSession() {

    if ( rulebase == null ) {
      rulebase = loadRuleBaseFromRuleAgent();
    }

        session = rulebase.newStatefulSession();
        System.out.println("strting process...");
       session.startProcess("insuranceProcess");
        System.out.println("Started Process..");
  return session;
    }
In above code if i commented out line :  session.startProcess("insuranceProcess");(In above code..) the error was resolved and executing properly..

please let me know why we need to code : session.startProcess("insuranceProcess");.if i am not using startProcess("String") method,Does it create any session problem anywhere.Please guide me on this.......