why wont the color start to change?

local speed = .5
local this = script.Parent
local color1 = Color3.fromRGB(255,0,0)
local color2 = Color3.fromRGB(0,0,255)

repeat
	this.TextColor3 = this.TextColor3 + Color3.fromRGB(-1,0,1)
	wait(.1)
until
	this.TextColor3 == color2

Error is on the line after repeat

You can't add TextColor3, please remove Text