LAN other players crash while entering door, DIM 3 doesn't exist

[BlueEyes9]

I have a LAN world with my bro and I. I, the host, can go through the doors just fine, but whenever he goes through them, he crashes. http://pastebin.com/myJKvaVZ Same crash every time, three different worlds.

[Nopotato]

I also have this problem.