Follow AI Wont Move

Hey! I am trying to create a zombie survival game and I am trying to create the AI to just follow the character. I followed the official unreal tutorial here:https://docs.unrealengine.com/latest/INT/Engine/AI/BehaviorTrees/QuickStart/1/index.html

My AI doesnt seem to move and I can’t find out what is wrong! My project is here:
https://drive.google.com/open?id=0B4P8_cD1s6RtR2hIdGhmcEl2ekE

I have the same problem at the moment with my spiders, in my level, and it looks likely I have to go through the whole entire spider tutorial again to find out what happened to the code to stop the spiders from
patrolling the area. I do have a Nav Volume Mesh laid down for them, but their AI logic has stopped
working.