How to teleport the player when he/she interacts with a gui?

I want to make the player teleport to a specific point when he/she interacts with a gui. The code is below, only one line i am having problem with, the rest are fine and works as intended.

local TweenService = game:GetService("TweenService")

local function TweenFromPlace(C1,C2)
	workspace.Camera.CFrame = C1.CFrame
	local TweenProps = {CFrame = C2.CFrame}
	local TI = TweenInfo.new(7.5, Enum.EasingStyle.Linear, Enum.EasingDirection.In, 1, false, 0)
	TweenPlay = TweenService:Create(workspace.Camera, TI, TweenProps)
	TweenPlay:Play()
end

script.Parent.MouseButton1Down:Connect(function()
	script.Parent.Parent.Visible = false
	script.Parent.Parent.Parent.This.Visible = false
	workspace.Camera.CFrame = workspace.Cam1.CFrame
	workspace.Camera.CameraType = Enum.CameraType.Scriptable
	workspace.Camera.CFrame = workspace.Cam1.CFrame
	
	-- this is where i am having problems, the line below
	game.Workspace.AriyanHacker29.HumanoidRootPart.Position = workspace.Part.Position
	
	
	TweenFromPlace(workspace.Cam1, workspace.Cam2)
	wait(7.5)
	TweenFromPlace(workspace.Cam2, workspace.Cam3)
	wait(7.5)
	TweenPlay:Cancel()
	workspace.Camera.CameraType = Enum.CameraType.Custom

	script.Parent.Parent.Visible = true
	script.Parent.Parent.Parent.This.Visible = false
	wait (18)
	print("DONE")
end)

local TweenService = game:GetService("TweenService")
local player = game:GetService("Players").LocalPlayer
--since i assume this is a localscript, we can grab the local player

local function TweenFromPlace(C1,C2)
    workspace.Camera.CFrame = C1.CFrame
    local TweenProps = {CFrame = C2.CFrame}
    local TI = TweenInfo.new(7.5, Enum.EasingStyle.Linear, Enum.EasingDirection.In, 1, false, 0)
    TweenPlay = TweenService:Create(workspace.Camera, TI, TweenProps)
    TweenPlay:Play()
end

script.Parent.MouseButton1Down:Connect(function()
    script.Parent.Parent.Visible = false
    script.Parent.Parent.Parent.This.Visible = false
    workspace.Camera.CFrame = workspace.Cam1.CFrame
    workspace.Camera.CameraType = Enum.CameraType.Scriptable
    workspace.Camera.CFrame = workspace.Cam1.CFrame
    workspace:WaitForChild(player.Name).HumanoidRootPart.CFrame = CFrame.new(workspace.Part)
	--Vector3 works as well.
    TweenFromPlace(workspace.Cam1, workspace.Cam2)
    wait(7.5)
    TweenFromPlace(workspace.Cam2, workspace.Cam3)
    wait(7.5)
    TweenPlay:Cancel()
    workspace.Camera.CameraType = Enum.CameraType.Custom

    script.Parent.Parent.Visible = true
    script.Parent.Parent.Parent.This.Visible = false
    wait (18)
    print("DONE")
end)

Just some minor changes, hopefully that solves your issue. If not, I'm sorry.