are you on an osi shard?
He mentioned OSI a while back.  
Sorry, the error you are talking about only happens when a rail file can't be found, or a waypoint is really out of wack.  If you are 5-7 steps from the Heartwood portal and due south, it should just "work".  I'm watching my guy walk the rail right now, and this is a freshly installed virtual machine.  I downloaded the script, rails, engine and ran the script.  No changes, or tweaks.  Just ran the script and off it goes.