[help] server no longer opening

[Darkrai]

My server was working fine until I attempted to remove caves. Now it gets stuck on this when I try to run them:

Spoiler

 

Master: [00:00:04]: DoLuaFile Error: #[string "scripts/map/level.lua"]:103: bad argument #1 to 'pairs' (table expected, got nil)

Master: #LUA ERROR stack traceback:

Master: @=[C]:-1 in (global) pairs (C) <-1--1>

Master: @scripts/map/level.lua:103 in (method) ChooseTasks (Lua) <86-145>

Master:    self =

Master:       min_playlist_position = 0

Master:       max_playlist_position = 999

Master:       id = SURVIVAL_TOGETHER

Master:       required_prefabs = table: 0x21166f0

Master:       version = 2

Master:       hideminimap = false

Master:       override_level_string = false

Master:       numrandom_set_pieces = 5

Master:       name = Default

Master:       substitutes = table: 0x21120d0

Master:       location = forest

Master:       random_set_pieces = table: 0x21587c0

Master:       desc = The standard Don't Starve experience.

Master:       overrides = table: 0x2110800

Master:    taskdefinitions = nil

Master:    tasklist = table: 0xdc51490

Master:    task_set = infused

Master:    task_set_data = nil

Master:    modfns = table: 0xdc504d0

Master: @scripts/worldgen_main.lua:327 in () ? (Lua) <315-426>

Master:    debug = false

Master:    world_gen_data = table: 0x10a939e0

Master:    level = table: 0xdc51260

Master: @=(tail call):-1 in ()  (tail) <-1--1>

Master: @=(tail call):-1 in ()  (tail) <-1--1>

Master: [00:00:04]: #[string "scripts/map/level.lua"]:103: bad argument #1 to 'pairs' (table expected, got nil)

 

...And it just repeats it over and over. Any ideas on what's going on? (Apologies if this isn't enough information. I have no idea how coding works.)

Forgot to mention: I'm on a mac, and I have the Advanced World Generation mod.