How do I properly save stringvalues with datastores?

So in my game, I've recently been working on a system to save the weapon you have equipped that works in the same script as my saving script for all the player's stats, but I'm using a stringvalue that keeps the name of the weapon equipped and looks for the name of the weapon in ReplicatedStorage. (I'm using stringvalues because datastores can't save objectvalues.) However, there's one problem. The saving doesn't work! Here's the script.

local DSService = game:GetService('DataStoreService'):GetDataStore('ZA3TestData')
game.Players.PlayerAdded:connect(function(plr)
    -- Define variables
    local uniquekey = 'id-'..plr.userId
    local leaderstats = Instance.new('Folder', plr)
    local savevalue1 =  Instance.new('IntValue')
    local savevalue2 = Instance.new('IntValue')
    local savevalue3 = Instance.new('IntValue', plr)
    local savevalue4 = Instance.new('IntValue')
    local savevalue5 = Instance.new('StringValue', plr)
    leaderstats.Name = 'leaderstats'
    savevalue4.Parent = leaderstats
    savevalue1.Parent = leaderstats
    savevalue2.Parent = leaderstats
    savevalue1.Name = 'Level'
    savevalue2.Name = 'Prestige'
    savevalue3.Name = "XP"
    savevalue4.Name = "Kills"
    savevalue5.Name = "SavedWeapon"

    -- GetAsync
    local GetSaved = DSService:GetAsync(uniquekey)
    if GetSaved then
        savevalue1.Value = GetSaved[1]
        savevalue2.Value = GetSaved[2]
        savevalue3.Value = GetSaved[3]
        savevalue4.Value = GetSaved[4]
        savevalue5.Value = GetSaved[5] or "Brick"
    else
        local NumbersForSaving = {savevalue1.Value, savevalue2.Value, savevalue3.Value, savevalue4.Value, savevalue5.Value}
        DSService:SetAsync(uniquekey, NumbersForSaving)
    end
end)

game.Players.PlayerRemoving:connect(function(plr)
local uniquekey = 'id-'..plr.userId
local Savetable = {plr.leaderstats.Level.Value, plr.leaderstats:FindFirstChild('Prestige').Value, plr.XP.Value, plr.leaderstats.Kills.Value, plr.SavedWeapon.Value}
DSService:SetAsync(uniquekey, Savetable)


end)

Also, when I load the game with the script, this is the error I get:

ServerScriptService.Player Stats:28: bad argument #3 to 'Value' (string expected, got nil)

Thanks!