This error was shown when a player teleported to a plot adjacent to a "hidden" plot from a different world: http://hastebin.com/gikoyixaje.avrasm This chunk does also not want to hide: 
This error was shown when a player teleported to a plot adjacent to a "hidden" plot from a different world:
http://hastebin.com/gikoyixaje.avrasm
This chunk does also not want to hide: