Can't Teleport a player?

I'm trying to teleport a player ~50 studs in front of where the camera is looking at, whenever they double tap the "w" key. I know how to teleport the player and find the direction of the camera (At least I think I'm doing it right, I could be wrong), but I can't seem to put them together without getting the same error:

15:33:11.773 - Players.McQuakyDuck.PlayerGui.LocalScript:37: bad argument #2 to '?' (Vector3 expected, got number)

All the code is in a LocalScript inside of StarterGui

--Getting the Camera
game.Players.PlayerAdded:connect(function(player)
    script.LocalScript:clone().Parent = player.CharacterAdded:wait()
end)   
 
 
--Local Variables  
local cam = workspace.CurrentCamera
local player = game.Players.LocalPlayer
game.Workspace:WaitForChild(player.Name)
local Char = player.Character
local Humanoid = Char:WaitForChild("Humanoid")
local Mouse = player:GetMouse()
local lastTapTime = 0
local clicked = false
local Trail = game.Workspace.Trail:Clone() 
_G.Energy = 100
local Mouse = player:GetMouse()
 
 
 
--Moving the Humanoid
    --Double Tap
enabled = true
Mouse.KeyDown:connect(function(key)
    if not enabled and clicked then
        return
    end
    if key == "w" and _G.Energy >= 25 then
    enabled = false
 
    local function onTap()
        if tick() - lastTapTime < 0.2 then
            print("double Click!")
            clicked = true
                --What happends when the user double taps
            player.Character.HumanoidRootPart.CFrame = CFrame.new(Vector3(cam.CFrame.lookVector + 50,cam.CFrame.lookVector + 50,cam.CFrame.lookVector + 50))
			--player.Character.UpperTorso.Velocity = cam.CFrame.lookVector * Vector3.new(1,0,1) * 400
            Trail.Parent = Char.HumanoidRootPart
            local attachment0 = Instance.new("Attachment", Char.Head)
            attachment0.Name = "TrailAttachment0"
            local attachment1 = Instance.new("Attachment", Char.HumanoidRootPart)
            attachment1.Name = "TrailAttachment1"
            Trail.Attachment0 = attachment0
            Trail.Attachment1 = attachment1
            wait(0.3)
            Trail:Remove()
            --_G.Energy = _G.Energy - 25
            wait(0.5)  
            end
        end
 
        onTap()
        lastTapTime = tick()
 
        wait(0.5)
        enabled = true
        clicked = false
    end
end)

Any help is appreciated!