Unknown error in multiplayer game.

[Sculpter]

Hello everyone,
Thanks for all the brilliant posts with all the questions but I have ran into a problem, I forged around for a while and finally got around to building my first map. It's not much, but as I wanted to test it online with a friend, when I tested by myself it ran fine, with a friend I get an error that pops up on both our screens.

I have placed 2 mappoints for both teams, team A, and Team B.

[Sculpter]

I have found what was causing the problem and for anyone else having trouble just PM me