How do I get this Global Datastore up and running?

This datastore is supposed to give new players 100 Credits when they join for the first time. Otherwise pull up their previous balance. Output Below!

local DataStore = game:GetService("DataStoreService"):GetGlobalDataStore("TrustCurrency")
local Repeats = game:GetService("DataStoreService"):GetGlobalDataStore("BeenThere")

game.Players.PlayerAdded:connect(function(plr)
    local inst = Instance.new("StringValue", plr)
    inst.Name = "Repeat"
    inst.Value  = "No"

    local bank = plr.PlayerGui.ScreenGui.Frame.Credits

    local stats = Instance.new("IntValue", plr)
    stats.Name = "leaderstats"

    local credits = Instance.new("IntValue", stats)
    credits.Name = "Credits"
    credits.Value = 0

    local key = "player-"..plr.userId

    local savedCredits = DataStore:GetAsync(key)
    local savedValue = Repeats:GetAsync(key)

    if savedValue == "No" then
        local creditcount = (credits.Value + 100)
        DataStore:SetAsync(key, creditcount)
        inst.Value = "Yes"
        Repeats:SetAsync(key, inst.Value)
    elseif savedValue == "Yes" then
        credits.Value = savedCredits
        print(savedValue)
    end
        bank.Text = credits.Value
end)

Server Output:

23:02:37.789 - Replication: Can't create default object of type Players

23:02:38.750 - ScreenGui is not a valid member of PlayerGui

23:02:38.760 - Script 'ServerScriptService.CurrencyDataStore', Line 9

23:02:38.763 - Stack End

Player -1 added

Shouldn't "plr.PlayerGui.ScreenGui" be correct since 'plr' is the local player? What is the Replication error about? What is wrong with line 9?

(I had help with this once...now it is changed and giving me trouble!)