theres a red line below the "end)" when i do a "while wait(6) do" in a script?

here is it, i maked a

while wait(5) do

then i put end after the script

while true do
	
	
	script.Parent.Size = Vector3.new(0.5, 0.25, 0.5)
	script.Parent.Parent.eye_1.Size = Vector3.new(0.5, 0.25, 0.5)
		wait(0.5)
	script.Parent.Parent.eye_1.Size = Vector3.new(0.5, 0.5, 0.5)
	script.Parent.Size = Vector3.new(0.5, 0.5, 0.5)
	
	
end)

but there is a red line below the "end)" if i remove the ")" the script will not work and will show a error in output, but if i remove the end, the script stop working... someone help pls