help Help with adding a tab to the server creation screen

[Lucemodok]

So I've been trying to get some custom server creation tabs to work in my mod, but I can't seem to make it work.

 

The code:

Spoiler

local CurrentScreen = GLOBAL.TheFrontEnd:GetActiveScreen()
if CurrentScreen and CurrentScreen.server_settings_tab and CurrentScreen.server_settings_tab.game_mode.spinner.enabled then
    local self = CurrentScreen

    self.server_settings_tab.game_mode.spinner:SetOptions(GLOBAL.GetGameModesSpinnerData(GLOBAL.ModManager:GetEnabledServerModNames()))
    self.server_settings_tab.game_mode.spinner:SetSelected("bigfreeze")
    self.server_settings_tab.game_mode.spinner:Changed()
    self.server_settings_tab.game_mode.spinner:Disable()

    local bigfreeze_locations = {
        "bigfreeze",
        "lonely_mine",
    }

    self.tabscreener.menu:Kill()
    self.tabscreener.menu = nil

    self.world_tabs = {}

    for index, location in ipairs(bigfreeze_locations) do
        self.tabscreener.sub_screens[location] = self:MakeWorldTab(index)
    end

    self:SetLevelLocations(bigfreeze_locations)

    self.tabscreener.menu = self:_BuildTabMenu(self.tabscreener)

    self:SetTab("mods")
end

 

Any help is much appreciated.

For clarity, this is in the modworldgenmain and the crash (which only happens when I click on a tab) is as follows:

Spoiler

[00:00:55]: [string "scripts/util.lua"]:940: attempt to perform arithmetic on local 'index' (a nil value)
LUA ERROR stack traceback:
scripts/util.lua:940 in (global) circular_index_number (Lua) <939-944>
   count = 5
   index = nil
scripts/widgets/redux/headertabs.lua:45 in (method) SelectButton (Lua) <43-47>
   self =
      enabled = true
      focus_target = false
      selected_index = 4
      shown = true
      parent = NineSlice
      focus_forward = MENU
      can_fade_alpha = true
      menu = MENU
      focus_flow_args = table: 2EF0B270
      inst = 104221 -  (valid:true)
      focus = true
      focus_flow = table: 2EF0B388
      name = HeaderTabs
      children = table: 2EF0ABB8
      callbacks = table: 2EF0B220
   index = nil

 

 

Edited March 31, 2021 by Lucemodok

[Bigfootmech]

[00:00:55]: [string "scripts/util.lua"]:940: attempt to perform arithmetic on local 'index' (a nil value)

In file:

scripts/util.lua

line:

940

tried to do something like:

a = index + b

but:

index is nil (hasn't been set yet)

 

If this isn't super clear, I also found a similar article on stackoverflow after a quick DuckDuckGO search

https://stackoverflow.com/questions/32001268/lua-attempt-to-perform-arithmetic-on-global-mapfinishes-a-nil-value

[Lucemodok]

I found a way for the index not to be nil, but I'm getting another error now.