C:\Program Files (x86)\Steam\SteamApps\common\dont_starve\mods\wort\scripts\prefabs\chester.lua

I've uploaded a fixed Chester.lua on mediafire here:
http://www.mediafire.com/download/e55zy7zv7kv1bji/chester.lua

File is for people who don't feel like adding the lines themselves, but it's really not even worth a topic :| Thought I'd post it here since I haven't been able to contact you.

CORRECT LINE:

--(" container")
inst:AddComponent("container")
inst.components.container:SetNumSlots(#slotpos)

inst.components.container.onopenfn = OnOpen
inst.components.container.onclosefn = OnClose

inst.components.container.widgetslotpos = slotpos
inst.components.container.widgetanimbank = "ui_chest_3x3"
inst.components.container.widgetanimbuild = "ui_chest_3x3"
inst.components.container.widgetpos = Vector3(0,-180,0)
inst.components.container.widgetpos_controller = Vector3(0,200,0)
inst.components.container.side_align_tip = 160

WHAT YOU HAD (missing last two lines):

--(" container")
inst:AddComponent("container")
inst.components.container:SetNumSlots(#slotpos)

inst.components.container.onopenfn = OnOpen
inst.components.container.onclosefn = OnClose

inst.components.container.widgetslotpos = slotpos
inst.components.container.widgetanimbank = "ui_chest_3x3"
inst.components.container.widgetanimbuild = "ui_chest_3x3"
inst.components.container.widgetpos = Vector3(0,-180,0)