code: public static void error(Subscriber<?> s, Throwable e) {
  		s.onSubscribe(EmptySubscription.INSTANCE);
  		s.onError(e);
  	}
docs: Calls onSubscribe on the target Subscriber with the empty instance followed by a call to onError with the
  supplied error.
  
  @param s target Subscriber to error
  @param e the actual error