attempting to make a plugin to spawn giants

[Code_Blue]

Hi,
I am new to Lua and I wanted to modify the tutorial code a bit to create a plugin to spawn giants (1.12.2). I think I got most of it down, but I am having an issue with two different parts of it. 
Console Errors:

[12:58:58] LUA: Plugins/SpawnGiants/spawngiants.lua:28: attempt to call method 'SpawnMob' (a nil value)
[12:58:58] Stack trace:
[12:58:58]  Plugins/SpawnGiants/spawngiants.lua(28): (no name)
[12:58:58]  [C](-1): FindAndDoWithPlayer
[12:58:58]  Plugins/SpawnGiants/spawngiants.lua(35): (no name)
[12:58:58] Stack trace end
[12:58:58] Error in <attached> calling function <callback>()


Code:

Code:

PLUGIN = nil

function Initialize(Plugin)
    Plugin:SetName("GiantSpawn")
    Plugin:SetVersion(1)

    -- Hooks

    PLUGIN = Plugin -- NOTE: only needed if you want OnDisable() to use GetName() or something like that

    -- Command Bindings
    cPluginManager.BindCommand("/spawngiant", "SpawnGiants.main", SpawnGiant, " ~ Spawn a Giant at someone's location")


    LOG("Initialised version " .. Plugin:GetVersion())
    return true
end
function SpawnGiant(Split, Player)
    if (#Split ~= 2) then
        -- Send the proper usage to the player and exit
        Player:SendMessage("Usage: /spawngiant [PlayerName]")
        return true
    end

    local CommandSent = false
    local GiantSpawnPerson = function(Giantee)
        if (Giantee:GetName() == Split[2]) then
            Player:SpawnMob(giant)
            Player:SendMessageSuccess(Split[2] .. " has been attacked by a giant")
            CommandSent = true
            return true
        end
    end
    cRoot:Get():FindandDoWithPlayer(Split[2], GiantSpawnPerson)

    if not(CommandSent) then
        Player:SendMessageFailure:(Split[2] .. " was not found")
    end

    return true
end

function OnDisable()
    LOG("Shutting down...")
end

I am new to Lua and new to programming in general. Any help would be appreciated (This is running on a raspberry pi, I am not sure if that makes any difference.)