Help with ServerScriptStorage?

Script is located in ServerScriptStorage

local ods = game:GetService("DataStoreService"):GetOrderedDataStore("Scores")
function updateBoard(board, data)
    for k,v in pairs(data) do
        local pos = k
        local name = v.key
        local score = v.value
        local dispname = board:findFirstChild("Name"..pos)
        local dispval = board:findFirstChild("Score"..pos)
        dispname.Text = tostring(name)
        dispval.Text = tostring(score)
    end 
end

while true do
    wait(10)
    local pages = ods:GetSortedAsync(false, 10)
    local data = pages:GetCurrentPage()
    updateBoard(game.Workspace.HighScore.TopBlock.SurfaceGui, data) -- change 'game.Workspace.HighScore.TopBlock.SurfaceGui' to where it will be
end

Error in Output ServerScriptService.Script:16: attempt to index local 'ods' (a nil value) I don't know why this dosent work? It is froms Dummiez Leaderboard, and I placed all the scripts in the right spots, but this has an error. Please help