I get this with r2156 & Wright Plaza.

[MODULES]       [10-21 08:07:12]    [ChatModule]: Initializing.
ERROR [ ]: System.NullReferenceException: Object reference not set to an instance of an object
  at OpenSim.Region.Environment.Modules.ChatModule.Initialise (OpenSim.Region.Environment.Scenes.Scene scene, IConfigSource config) [0x00000]
  at OpenSim.Region.Environment.ModuleLoader.InitializeModule (IRegionModule module, OpenSim.Region.Environment.Scenes.Scene scene) [0x00000]
  at OpenSim.Region.Environment.ModuleLoader.LoadRegionModules (System.String dllName, OpenSim.Region.Environment.Scenes.Scene scene) [0x00000]
  at OpenSim.Region.Environment.ModuleLoader.PickupModules (OpenSim.Region.Environment.Scenes.Scene scene, System.String moduleDir) [0x00000]
  at OpenSim.OpenSimMain.StartUp () [0x00000]
  at OpenSim.Application.Main (System.String[] args) [0x00000]

This is the last part of the OpenSim.ini that started ; Uncomment the following for IRC bridge

; experimental, so if it breaks... keep both parts... yada yada
; also, not good error detection when it fails
[IRC]
server  = irc.efnet.net
nick    = wp
channel = #opensim-osgrid
the region.