html parser for ios from ben reeves not work

i got parse from here I make all 3 step from instruction on github, but i can't understand how can i make to work example. I get example from git and past it in viewcontroller.m (am i right?) but after this xcode show me very much mistacke like

    if (error) {   //expected indetifier or '(' 
or
/Users/admin/Desktop/sddsd/sddsd/ViewController.h:27:1: Unknown type name 'HTMLNode'
/Users/admin/Desktop/sddsd/sddsd/ViewController.h:20:42: No visible @interface for 'NSXMLParser' declares the selector 'initWithString:error:'

Where do you want to paste the sample code , what would it work?