Problem with DataStoring an ObjectValue?

You're saving numbers in your script to ds1. You're trying to set ObjectValue to a number (your points value) on line 20 because the loaded data IS a number. ObjectValue's Value is supposed to be an Object, not a number. You're also saving over one data store with different data (SpawnPoint's Value and Points Value). You need to use separate stores or use a table.

local DataStore = game:GetService("DataStoreService")
local main_store = DataStore:GetDataStore("StatsDataStore")


local function save_stats(key, Points, Spawnpoint)
    local saved = {

        ['Points'] = Points;
        ['SpawnPoint'] = Spawnpoint;

    }
    if pcall(function()
        main_store:SetAsync(key, saved)
    end)
    then 
        print("data saved")
    else
        print("data did not save")
    end
end

-- This is the folder that contains all your spawns!
local spawns = workspace:WaitForChild('Spawns')
game.Players.PlayerAdded:Connect(function(player)
    local key = string.format("%s_%s", player.Name, player.UserId)
    local saved_key = main_store:GetAsync(key) or false
    local saved_points = saved_key and saved_key.Points or 0
    -- Put a default spawn in your folder, this will be the spawn that gets set if nothing is saved
    -- replace 'default_spawn' with whatever you name yours
    local saved_spawn = saved_key and saved_key.SpawnPoint or 'default_spawn'


    print(saved_key, saved_points, saved_spawn)

    local PlayerStats = Instance.new("Folder")
    PlayerStats.Name = "PlayerStats"


    local Points = Instance.new("IntValue", PlayerStats)
    Points.Name = "Points"
    Points.Value = saved_points


    local SpawnPoint = Instance.new("ObjectValue", PlayerStats)
    SpawnPoint.Name = "SpawnPoint"
    -- Remember saved spawn is a name, so we have to look for it
    SpawnPoint.Value = spawns[saved_spawn]

    PlayerStats.Parent = player

    -- You should be using this in something like
    -- StarterCharacterScripts with RemoteEvents

    Points.Changed:Connect(function()
        -- Can't save objects, save the value or name.
        save_stats(key, Points.Value, SpawnPoint.Value.Name)
    end)    

    SpawnPoint.Changed:Connect(function()
        -- Can't save objects, save the value or name.
        save_stats(key, Points.Value, SpawnPoint.Value.Name)
    end)
end)