If you get a rejection reason 16179 on the NEST platform it means that the order has been rejected at the exchange. When you place orders in equities, do make sure you place them within 5% of the current market price.
I can't seem to find the circular/error code to give you documented information, but this is definitely the reason why it was rejected.
Edit: I've got my hands on the circular which gives some info about this.
Thanks for the info Hanan…