CFrame is not a valid member of PlayerMouse? [qwertyuiop]

I'm making a script that makes the head follow the mouse. AANNNND...

I've been receiving this error; CFrame is not a valid member of PlayerMouse

How would i then go about solving this problem?

LOCAL SCRIPT

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local RemoteEvent = game.ReplicatedStorage.RemoteEvent
repeat wait() until Player.Character
local Char = Player.Character

Mouse.Move:Connect(function()
    local Head = Player.Character.Head
    local Vec = Mouse.CFrame

    local Neck = Head.Neck
    RemoteEvent:FireServer(Neck, Vec)
end)

SERVERSCRIPT

local Remote = game.ReplicatedStorage.RemoteEvent
Remote.OnServerEvent:Connect(function(player, Neck, Vec)
    for i = 0,1,.01 do
        wait()
        Neck.C0:lerp(Vec, i)
    end
end)