"attempt to index local 'hit' (a nil value)" Output Error?

As the title states, I'm receiving the output error:

Workspace.Part.SurfaceGui.Frame.Frame.Frame.TextButton.Scri:7: attempt to index local 'hit' (a nil value)

Whenever I use this script:

local price = 50
local light = game.Lighting.globaltyc
local ipath = game.Workspace.Tycoon.Tycoon.InvInt

script.Parent.MouseButton1Click:connect(function(hit)

    local user = game.Players:GetPlayerFromCharacter(hit.Parent)
    local stats = user:findFirstChild("leaderstats")
    player = game.Players[hit.Name]
    if game.Players:findFirstChild(hit.Name) == light.TycUser1.Value then
        ipath.Stone.Value = ipath.Stone.Value - 1
        if stats ~= nil then
            local cash = stats:findFirstChild("Cash")
            cash.Value  = cash.Value + price
        end
    end
end)

A few important things about the script:

• It is NOT a localscript
• It is inside of a textbutton GUI element
• I have used similar scripts to this, and haven't had to define "hit".
• I've read on the Wiki that it is caused by an undefined parameter.

As always, any help is greatly appreciated, and thank you for reading!