As far as I can see the tutorial doesn't really point out that you have to use real textures. The ones in the ZHLT.wad are special tool textures, they don't always act the way you expect them to. And as a beginner you probably don't need them yet.

Go into Valve Hammer settings and add various wad files from the svencoop folder (nw.wad is a good one, for instance). Now try to add some of those textures to your map and compile again.