Problem showing route in the map

[StrUng]

Hello, i am new to modding in GTA 5 and am following a tutorial, but when i declare the .showroute = true variable in game it doesn't show me the actual route, only the blip of the destination :

using GTA;
using GTA.Math;
using GTA.Native;
using System;
using System.Windows.Forms;

public class ProjectRazor : Script
{
bool introMissionRunning = false;
Blip carBlip;
Blip carDestinationBlip;
Vehicle TargetCar;
Vector3 carPos = new Vector3(-471.9307f, -60.41102f, 43.9504f);
Vector3 carDestinationPos;
Vector3 walkDestinationPos;

missionTask Task;

enum missionTask
{
    freemode,
    getInsideCar,
    goDestination,
    parkCar,
    walkToEnd,
}


public ProjectRazor()
{


    Tick += (o, e) => Processing();
    KeyUp += (o, e) =>
    {
        if (e.KeyCode == Keys.NumPad1) Wait(500);  Initialize();
        if (e.KeyCode == Keys.NumPad2) Deinitialize();
    };


}

void Processing()
{
    if(introMissionRunning)
    {
        switch(Task)
        {
            case missionTask.freemode: freemode(); break;
            case missionTask.getInsideCar: EnterTargetVehicle(); break;
            case missionTask.goDestination: goDestination(); break;
            case missionTask.parkCar: parkCar(); break;
            case missionTask.walkToEnd: walkToEnd(); break;
        }
    }
}
void freemode()
{
    GTA.UI.Screen.ShowSubtitle("Find the ~b~ car ~w~ to reposess", 3000);
    if (Game.Player.Character.Position.DistanceTo(carPos) < 12f)
    {
        Task = missionTask.getInsideCar;
    }
}

void EnterTargetVehicle()
{
    GTA.UI.Screen.ShowSubtitle("Get inside the vehicle");
    if (Game.Player.Character.IsSittingInVehicle(TargetCar))
    {
        carDestinationBlip = World.CreateBlip(new Vector3(-25.16854f, -1238.732f, 28.33501f));
        carDestinationBlip.Color = BlipColor.Yellow;
        carDestinationBlip.ShowRoute = true;
        carDestinationBlip.Name = "Parking Lot";
        Task = missionTask.goDestination;
    }
}

void goDestination()
{
    if (carBlip.Exists())
    {
        carBlip.Delete();
    }
    GTA.UI.Screen.ShowSubtitle("Deliver the ~b~Car ~w~to its ~y~Destination", 4000);
}

void parkCar()
{

}

void walkToEnd()
{

}

void Initialize()
{
    if (TargetCar == null)
    {
        TargetCar = World.CreateVehicle(new Model(409049982), carPos, -94.88273f);
        carBlip = TargetCar.AddBlip();
        carBlip.Sprite = (BlipSprite)229;
        carBlip.Color = BlipColor.Blue;
        carBlip.Name = "Sport Car";
    }
    introMissionRunning = true;
    Task = missionTask.freemode;
    walkDestinationPos = new Vector3(-82.88152f, -1240.195f, 28.09408f);
    carDestinationPos = new Vector3(-25.16854f, -1238.732f, 28.33501f);
}
void Deinitialize()
{
    if (TargetCar != null)
    {
        TargetCar.Delete();
        TargetCar = null;
    }
    if(carBlip != null)
    {
        carBlip.Delete();
        carBlip = null;
    }
    if (carDestinationBlip != null)
    {
        carDestinationBlip.Delete();
        carDestinationBlip = null;
    }
    introMissionRunning = false;
}

}