[UNANSWERED] Why is my item not a valid member of Backpack?

I am making a test game, and I thought you could access backpack items just by calling,

``

   player.Backpack.ITEM

But I guess you can't, because I am getting the error, ``

    10:53:33.764 - Wand is not a valid member of Backpack

Here is my server script that is being called from a localscript when the wand is activated, ``
local repStorage = game:GetService("ReplicatedStorage") local castSpellEvent = repStorage:WaitForChild("CastSpell")

     castSpellEvent.OnServerEvent:connect(function(player, word)
print(word)
if word == "ReFe" then
    local yeet = player:WaitForChild("Backpack")
            print("ReFe FIREWHIP")

    local ray = Ray.new(yeet.Wand.Handle.CFrame.p, 
      yeet.Wand.Handle.CFrame.p.unit * 300)

 local part, position = workspace:FindPartOnRay(ray, player.Character, true, true)
    local beam = Instance.new("Part", workspace)
    beam.Name = "FireWhip"
    local distance = (player.Character.HumanoidRootPart.Position - position).magnitude
    beam.BrickColor = BrickColor.new("Bright red")
    beam.Locked = true
    beam.Anchored = true
    beam.Size = Vector3.new(0.3, 0.3, distance)
    beam.CFrame = CFrame.new(player.Character.HumanoidRootPart.Position,    
             position) * CFrame.new(0, 0, -distance / 2)    




    if part then
    local humanoid = part.Parent:FindFirstChild("Humanoid")

  if not humanoid then
    humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
  end

  if humanoid then
    humanoid:TakeDamage(30)
end
 end

end
   end)