Object reference not set to an instance of an object

Hey I’m following this guys tutorial and this script is supposed to be able to change day and night and the color of the water depending on if it is day or night. But im getting this error on line 57.
I don’t know what to do. The day and night cycles fine and changes the lighting, just the water is not working.

NullReferenceException: Object reference not set to an instance of an object
Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.String cacheKeyName, System.Type cacheKeyTypes, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.Object args, System.String cacheKeyName, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.GetProperty (System.Object target, System.String name)
UnityScript.Lang.UnityRuntimeServices.GetProperty (System.Object target, System.String name)
TOD.OnGUI () (at Assets/DayNightCycle/TOD/TOD.js:57)

var slider : float;
var slider2 : float;
var Hour : float;
private var Tod: float;

var sun: Light;

var speed = 50;

var NightFogColor : Color;
var DuskFogColor : Color;
var MorningFogColor : Color;
var MiddayFogColor : Color;

var NightAmbientLight : Color;
var DuskAmbientLight : Color;
var MorningAmbientLight : Color;
var MiddayAmbientLight : Color;

var NightTint : Color;
var DuskTint : Color;
var MorningTint : Color;
var MiddayTint : Color;

var SkyBoxMaterial1 : Material;
var SkyBoxMaterial2 : Material;

var SunNight : Color;
var SunDay : Color;

//THIS WAS ADDED IN TUTORIAL NUMBER 24. It allows for changing the color that reflects of a water object.
//Uncheck IncludeWater if you are not interested in using this.
var Water : GameObject;
var IncludeWater = false;
var WaterNight : Color;
var WaterDay : Color;


function OnGUI () {

if(slider >= 1.0)
{
	slider = 0;
}

//slider= GUI.HorizontalSlider( Rect(20,20,200,30), slider, 0,1.0);
Hour= slider*24;
Tod= slider2*24;
sun.transform.localEulerAngles = Vector3((slider*360)-90, 0, 0);
slider = slider +Time.deltaTime/speed;
sun.color = Color.Lerp (SunNight, SunDay, slider*2);

//THIS WAS ADDED IN TUTORIAL NUMBER 24. It allows for changing the color that reflects of a water object.
//Uncheck IncludeWater if you are not interested in using this.
if (IncludeWater == true)
{

***ERROR***

    Water.GetComponent.Renderer.material.SetColor("_horizonColor", Color.Lerp (WaterNight, WaterDay, slider2*2-0.2));
}

if(slider<0.5){
slider2= slider;
}
if(slider>0.5){
slider2= (1-slider);
}
sun.intensity = (slider2-0.2)*1.3;


if(Tod<4){
//it is Night
RenderSettings.skybox=SkyBoxMaterial1;
RenderSettings.skybox.SetFloat("_Blend", 0);
SkyBoxMaterial1.SetColor ("_Tint", NightTint);
RenderSettings.ambientLight = NightAmbientLight;
RenderSettings.fogColor = NightFogColor;
}
if(Tod>4&&Tod<6){
RenderSettings.skybox=SkyBoxMaterial1;
RenderSettings.skybox.SetFloat("_Blend", 0);
RenderSettings.skybox.SetFloat("_Blend", (Tod/2)-2);
SkyBoxMaterial1.SetColor ("_Tint", Color.Lerp (NightTint, DuskTint, (Tod/2)-2) );
RenderSettings.ambientLight = Color.Lerp (NightAmbientLight, DuskAmbientLight, (Tod/2)-2);
RenderSettings.fogColor = Color.Lerp (NightFogColor,DuskFogColor, (Tod/2)-2);
//it is Dusk

}
if(Tod>6&&Tod<8){
RenderSettings.skybox=SkyBoxMaterial2;
RenderSettings.skybox.SetFloat("_Blend", 0);
RenderSettings.skybox.SetFloat("_Blend", (Tod/2)-3);
SkyBoxMaterial2.SetColor ("_Tint", Color.Lerp (DuskTint,MorningTint,  (Tod/2)-3) );
RenderSettings.ambientLight = Color.Lerp (DuskAmbientLight, MorningAmbientLight, (Tod/2)-3);
RenderSettings.fogColor = Color.Lerp (DuskFogColor,MorningFogColor, (Tod/2)-3);
//it is Morning

}
if(Tod>8&&Tod<10){
RenderSettings.ambientLight = MiddayAmbientLight;
RenderSettings.skybox=SkyBoxMaterial2;
RenderSettings.skybox.SetFloat("_Blend", 1);
SkyBoxMaterial2.SetColor ("_Tint", Color.Lerp (MorningTint,MiddayTint,  (Tod/2)-4) );
RenderSettings.ambientLight = Color.Lerp (MorningAmbientLight, MiddayAmbientLight, (Tod/2)-4);
RenderSettings.fogColor = Color.Lerp (MorningFogColor,MiddayFogColor, (Tod/2)-4);

//it is getting Midday

}
}

Water.GetComponent.Renderer.material.SetColor(“_horizonColor”, Color.Lerp (WaterNight, WaterDay, slider2*2-0.2));

Should probably be:

  Water.GetComponent<Renderer>().material.SetColor("_horizonColor", Color.Lerp (WaterNight, WaterDay, slider2*2-0.2));