[Ancient]

Think of the waypoint system like a remote control that requires batteries.
The waypoint system is the remote control and the batteries are the waypoints placed on the map. If not all the waypoints are connected properly, you must adjust.
It's the same way for putting some battery's in a remote control, if everything doesn't connect properly then nothing works.

This problem with waypoint nr. 0 is that you made some one-way waypoint paths and didn't make another path or route. To avoid this, make sure all of you waypoints are connected to a two-way waypoint path. If all else fails, try and make all waypoint paths two-way paths.

What you need to look for is some waypoints leading to a corner or dead-end area of the map. Look at the waypoint paths, if they are all one-way leading to the dead-end, then that is the problem.