Using TLS in pjsua application

I am trying to use TLS in pjsua app, but i get an error here:

try{
      ep.transportCreate(pjsip_transport_type_e.PJSIP_TRANSPORT_TLS, sipTpConfig);
} catch (Exception e) {
      System.out.println(e);
}

The error is: Code: 171060 unsupported transport (pjsip_eunsuptransport).

Do you know something about it?