In order to get you up and running without a bunch of noise, download the starter project for this tutorial. It’s based on the SpriteKit Game template and already has some of the more tedious work done for you.
This way you can focus on creating an awesome zombie-rich environment level without tinkering with all the underlying logic. I hope this will resolve your issue but in case if there is any doubt then check 192.168.0.1 IP for more information.