Spring RTS Engine

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if condition == 'value' then

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[      0] Failed to load: spacerock.lua  ([string "LuaRules/Gadgets/spacerock.lua"]:19: attempt to index field '?' (a nil value))

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function widget:AddConsoleLine(msg, priority)
Spring.Echo ("blabla")
end

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local testUnitDefID = UnitDefNames[testUnitName].id

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function gadget:GetInfo()
  return {
    name      = "Space Rock",
    desc      = "Spawns rocks from space.",
    author    = "oksnoop2",
    date      = "4/24/2010",
    license   = "GNU GPL, v2 or later",
    layer     = 0,
    enabled   = true,  --  loaded by default?
  }
end


if not gadgetHandler:IsSyncedCode() then
  return false -- no unsynced code
end


----- Settings -----------------------------------------------------------------

local meteorDefName  = "f1" -- meteor unit name, use a unit with a death explosion
local meteorInterval = 1 -- time between the arrival of meteors, in seconds
local fallGravity = 1
local meteorSpawnHeight = 5000
local burnEffect1 = "smallburn" -- CEG used for the meteor trail, needs to be visible out of los
local burnEffect2 = "medburn"

----------------------------------------------------------------------------------


local meteors = {} -- meteor set

function gadget:GameFrame(frame)

  if frame % (30 * meteorInterval) == 0 then 
    -- pick a random location as the meteor spawn point
    local meteorSpawnX = math.random(Game.mapSizeX)
    local meteorSpawnZ = math.random(Game.mapSizeZ)
    local meteorSpawnY = Spring.GetGroundHeight(meteorSpawnX, meteorSpawnZ) + meteorSpawnHeight
    
    -- create the meteor
    local meteorID = Spring.CreateUnit(meteorDefName, meteorSpawnX, meteorSpawnY, meteorSpawnZ, "n", Spring.GetGaiaTeamID()) -- will ignore Y and spawn at ground level
    meteors[meteorID] = true -- put it in the meteor set
    
    Spring.MoveCtrl.Enable(meteorID) -- tell spring we'll take care of moving the meteor
    Spring.MoveCtrl.SetPosition(meteorID, meteorSpawnX, meteorSpawnY, meteorSpawnZ) -- this time the height will be set correctly
    Spring.MoveCtrl.SetGravity(meteorID, fallGravity) -- make gravity affect the meteor
  end
  
  for meteorID in pairs(meteors) do  -- loop through every meteor in the meteor set
    local x, y, z = Spring.GetUnitPosition(meteorID)
    local h = Spring.GetGroundHeight(x, z)
    if y < h then -- if the meteor below ground level
      Spring.DestroyUnit(meteorID) -- make it explode
      meteors[meteorID] = nil -- remove it from the meteor set
    else -- above ground, show the meteor trail
      Spring.SpawnCEG(burnEffect1, x, y + 30, z)
      Spring.SpawnCEG(burnEffect2, x, y, z)
    end
  end
end