"attempt to index upvalue 'Drops' (a nil value)" error when trying to drop item from static object?

Im trying to prepare a resource gethering mechanic from environment such as from tree. At 49th line i am getting the error that i mentioned at title.

Also is there easier way to make item drop? I just want that Log piece drop to ground so i can pick it to my inventory.

This is the ServerStorage part at Explorer: https://imgur.com/W8mHvXH

And this is what happens after progress bar completed: https://imgur.com/Hh8fjy9

local Player= game:GetService("Players").LocalPlayer
local Char = Player.Character
local Cursor = Player:GetMouse()
local Gather = true

local Items = {
    "Log";
    "Stone";
    }
local ServerStorage = game:GetService("ServerStorage")
local Drops = ServerStorage:FindFirstChild("Drops")

function ShowProgress(resource)
    if resource == 'Tree' then
        for i = 0,1, .01 do
            RG.BG.Bar.Progress.Size = UDim2.new(i,0,1,0)
            wait()
        end
    elseif resource == 'Rock' then
        for i = 0,1, .005 do
            RG.BG.Bar.Progress.Size = UDim2.new(i,0,1,0)
            wait()
        end
    end
end

Cursor.Button1Down:connect(function()
local Char = Player.Character or Player.CharacterAdded:Wait()

    if Cursor.Target ~= nil and Cursor.Target.Parent.Name == 'Tree' and  Gather == true then
        local Wood = Cursor.Target
        if (Wood.Position - Char.HumanoidRootPart.Position).magnitude <10 then
            Gather = false
            RG = Player.PlayerGui.Gathering
            RG.BG.Visible = true
            Char.Humanoid.WalkSpeed = 0
            ShowProgress('Tree')
            Char.Humanoid.WalkSpeed = 16

            for i,v in pairs(Wood.Parent.Leaves:GetChildren()) do
                if v:IsA('Part') then
                    v.Anchored = false
                end
            end

            Wood:Destroy()
            --Drop Wood
            local source = Items[1]
                local Clone = Drops:FindFirstChild(source):Clone()
                Clone.Parent = workspace
                Clone.CFrame =Wood.Cframe * CFrame.new(0,2,0)



            RG.BG.Visible = false
            Gather = true
        end
    end
    if Cursor.Target ~= nil and Cursor.Target.Name == 'Rock' and  Gather == true then
        local Rock = Cursor.Target
        if (Rock.Position - Char.HumanoidRootPart.Position).magnitude <10 then
            Gather = false
            RG = Player.PlayerGui.Gathering
            RG.BG.Visible = true
            Char.Humanoid.WalkSpeed = 0
            ShowProgress('Rock')
            Char.Humanoid.WalkSpeed = 16

            Rock:Destroy()
            --Drop Stone
            RG.BG.Visible = false
            Gather = true
        end
    end

end)