Frame is not a valid member of ScreenGui?

So, here's the hierarchy for the ScreenGui.

• ScreenGui
  • Interaction (localscript; code is situated here)
  • Frame
    • TextLabel
  • Chair
    • No
    • Yes

And the only thing that's bugging the code is one of the variables, but they all seem to logically be assigned correctly. Help?

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local gui = player:WaitForChild("PlayerGui").ScreenGui.Frame.TextLabel
local pinetree = game.Workspace.PineTree
local chair = game.Workspace.Chair
local chairframe = script.Parent.Chair

-- This should work, tbh.
mouse.Move:connect(function()
    local target = mouse.Target
    if target.Parent:IsA("Model") then
        if target.Parent == pinetree then
            gui.Text = "Pine tree"
            gui.Visible = true
            gui.Position = UDim2.new(0,mouse.X,0,mouse.Y)
        elseif target.Parent == chair then
            gui.Text = "Chair"
            gui.Visible = true
            gui.Position = UDim2.new(0,mouse.X,0,mouse.Y)
        else
            gui.Visible = false
        end
    end
end)