TextLabel isn't a valid member of ScreenGui?

When I tried to run a code that makes a little window pop up when you equip an item, the output said: "TextLabel is not a valid member of ScreenGui". I am confused.

local sword = game.Workspace.ClassicSword

sword.Equipped:Connect(function(eqp)
    script.Parent.ScreenGui.TextLabel.BackgroundTransparency = 0
    script.Parent.ScreenGui.TextLabel.TextTransparency = 0
    script.Parent.ScreenGui.TextLabel.Text = "This is incredible!"
    script.Parent.Ding:Play()
    wait(6)
    script.Parent.ScreenGui.TextLabel.Text = "It seems you have found an artifact from this planet."
    script.Parent.Ding:Play()
    wait(6)
    script.Parent.ScreenGui.TextLabel.Text = "It is an ancient sword."
    script.Parent.Ding:Play()
    wait(6)
    script.Parent.ScreenGui.TextLabel.Text = "The sword may be useful later on."
    script.Parent.Ding:Play()
    wait(6)
    script.Parent.ScreenGui.TextLabel.BackgroundTransparency = 1
    script.Parent.ScreenGui.TextLabel.TextTransparency = 1
end)