Confusing error, help please? [SOLVED] [closed]

I'm getting too many complaints on this not working. But I don't know how to fix it, please help?

I have the following code for a currency converter. I use DataStore to save statistics. Could that be why it doesn't work?

button = script.Parent
WhatIHave = script.Parent.Parent.WhatIHave
Estimated = script.Parent.Parent.Estimated.Value
p = game.Players.LocalPlayer
button.MouseButton1Click:connect(function ()
    if p.leaderstats.Cash >= WhatIHave.Value then
        p.leaderstats.Cash = p.leaderstats.Gems - WhatIHave.Value
        p.leaderstats.Diamonds = p.leaderstats.Diamonds + Estimated.Value
        repeat
            i = 1 
            script.Parent.Text = "Transaction Complete"
            wait(0.5)
            script.Parent.Text = ""
            i = i+1
        until i==5
    else
        repeat
            i = 1 
            script.Parent.Text = "Insufficient Funds"
            wait(0.5)
            script.Parent.Text = ""
            i = i+1
        until i==5
    end
end)

The output says attempt to compare number with userdata Line 6. Similar issue when someone buys a developer product. It won't give what they bought.

buybutton = script.Parent
msp = game:GetService("MarketplaceService")
id = 19251902
p = game.Players.LocalPlayer
buybutton.MouseButton1Click:connect(function ()
    msp:PromptPruouctPurchase(p,id)
    p.leaderstats.Diamonds = p.leaderstats.Diamonds + 10
end)

Output: attempt to perform arithmetic on field 'Diamonds' (a userdata value) Line 7

I need to fix this as soon as possible, as this is causing mayhem on my game.

Everything is in a LocalScript