Why is this not working?

When building the code below, I keep getting an error saying:

Compile Error
Unable to create new object of abstract "Type"

With no debugger, I'm clueless as to what I'm doing wrong. I am new to all this OOP stuff, but from what I've learned so far my code should be fine. Could someone enlighten me? :)

'CREATE GLOBAL LIST FOR SPRITE 
Global SpriteList:TList = CreateList()

'OBJECT:
'--- A simpler way to work with Images
Type tSprite
'--- SPRITE PROPERTIES ---
	Field Image:TImage
	Field Mode:Int
	Field ScaleX:Float
	Field ScaleY:Float
	Field Angle:Float
	Field Alpha:Float
	Field Tint:Int [3]
'-------------------------
	
'--- SPRITE CONSTRUCTOR ---
	Function Create:tSprite (_Image:TImage, _Mode:Int = SOLIDBLEND)
	'--- CREATE NEW SPRITE 
		Local o:tSprite = New tSprite
		'--- INITIATE SPRITE WITH DEFAULTS
			o.Image	= _Image
			o.Mode	= _Mode
			o.ScaleX	= 1.0
			o.ScaleY	= 1.0
			o.Angle	= 0.0
			o.Alpha	= 1.0
			o.Tint	= [255,255,255]
	'--- ADD NEW SPRITE TO LIST
		SpriteList.AddLast(o)
	'--- RETURN CREATED OBJECT 
		Return o
	End Function
'--------------------------

'--- RENDER METHOD ---
	Method Render (_X:Float, _Y:Float, _Frame:Int = -1)
	'--- CREATE TEMPORARY VARIABLES
		Local _ScaleX:Float
		Local _ScaleY:Float
		Local _Angle:Float
		Local _Alpha:Float
		Local _Mode:Int
		Local _Tint:Int [3]
		
	'--- STORE CURRENT SETTINGS
		_Angle		= GetRotation ()
		_Alpha		= GetAlpha ()
		_Mode		= GetBlend ()
		GetScale 		_ScaleX,_ScaleY
		GetColor 		_Tint[0],_Tint[1],_Tint[2]
		
	'--- SET OBJECTS SETTINGS	
		SetScale		ScaleX, ScaleY 		
		SetRotation	Angle
		SetAlpha		Alpha
		SetBlend		Mode
		SetColor		Tint[0], Tint[1], Tint[2]
		
	'--- SET FRAME
		If _Frame = -1 Then _Frame = Frame
		
	'--- DRAW IMAGE
		DrawImage		Image, _X, _Y, _Frame
		
	'--- RESTORE SETTINGS
		SetScale		_ScaleX, _ScaleY 		
		SetRotation	_Angle
		SetAlpha		_Alpha
		SetBlend		_Mode
		SetColor		Tint[0], Tint[1], Tint[2]
	End Method 		
'-----------------------
	
	Method Update() Abstract

End Type