So I keep getting this error Expected '(','{' or <string>, got ':' On line 25. Help?

Sand = game.Workspace:WaitForChild("Sand")
local TouchableParts = {}
local tableposition = 1

for i, v in pairs (Sand:GetChildren()) do
    if v:IsA("BasePart") then
        table.insert(TouchableParts, tableposition, v)
        tableposition = tableposition + 1
    end
end


local TouchableParts = {}
local tableposition = 1

for i, v in pairs (Sand:GetChildren()) do
    if v:IsA("BasePart") then
        table.insert(TouchableParts, tableposition, v)
        tableposition = tableposition + 1
    end
    wait()
end

for i, v in pairs (TouchableParts) do
    v:Touched:Connect(function(hit)
        local player = game.Players:GetPlayerFromCharacter(hit.Parent)
        if player then
           game.ReplicatedStorage.GravityController.disabled = false
        end
    end)
end