How do you make a gui when you click it it changes color?

On the scripting tutorial the man said to do this script with a text button with nothing else.This is what he said to do in the script.

button = script.Parent
blue = button.BackgroundColor3
red = Color3.new(1,0,0)
green = Color3.new(0,1,0)

function changeColor()
if button.BackgroundColor3 == blue then
button.BackgroundColor3 = red
elseif button.BackgroundColor3 == red then
button.BackgroundColor3 = green
else
button.BackgroundColor3 = blue
end
end

button.MouseButton1Click:connect(changeC­olor)

button = script.Parent
blue = button.BackgroundColor3
red = Color3.new(1,0,0)
green = Color3.new(0,1,0)
print("Found colors and button")

script.Parent.MouseButton1Click:connect(function changeColor()
print("Player Clicked")
if button.BackgroundColor3 == blue then
button.BackgroundColor3 = red
print("Button is now red")
elseif button.BackgroundColor3 == red then
button.BackgroundColor3 = green
print("Button is now green")
else
button.BackgroundColor3 = blue
print("Button is blue")
end
end)

I believe this should work now. I added a few prints.. Just to see what the output is.. If you can test it and see if it works now.. That would be great :D