code: public void logError(String message, Object sender) {
          getEventManager().sendEvent(this, IErrorEvents.class, "onError", new Object[] { message, sender });
      }
docs: Logs an error by sending an error event to all listeners.
  
  Error events can be generated by any part of GearVRF,
  from any thread. They are always sent to the event receiver
  of the GVRContext.
  
  @param message error message
  @param sender object which had the error
  @see IErrorEvents