Question Set the component data of VFX error.[Solved]

Hi, I am adding hitting VFX to my game. I use the event system to trigger the VFX. However, the VFX will always appear at the last hit position. And the first position of the VFX will be the translation of the prefab's translation. What can I do about this situation?
here is my hit system to spawn the VFX.

Code (CSharp):

1. public partial class FireBallHitSystem : SystemBase
2. {
3.     EndSimulationEntityCommandBufferSystem ecbSystem;
4.     private Entity hitPrefab;
5.     NativeQueue<float2> positions;
6.     EntityCommandBuffer ecb;
7.     protected override void OnCreate()
8.     {
9.         ecbSystem = World.GetOrCreateSystem<EndSimulationEntityCommandBufferSystem>();
10.         World.GetOrCreateSystem<FireBallAttackSystem>().OnFireBallHit += EventSubscribe;
11.     }
12.  
13.  
14.     private void EventSubscribe(object sender, FireballHitEventArgs e) {
15.         ecb.Instantiate(hitPrefab);
16.         Debug.Log(e.x +"    ###   " + e.y);
17.         ecb.SetComponent(hitPrefab, new Translation { Value = new float3 { x = e.x, y = e.y } });
18.      
19.     }
20.  
21.     protected override void OnUpdate()
22.     {
23.         if(hitPrefab == Entity.Null)
24.         {
25.             hitPrefab = GetSingleton<YellowHitAuthoringComponent>().Prefab;
26.  
27.             //we must "return" after setting this prefab because if we were to continue into the Job
28.             //we would run into errors because the variable was JUST set (ECS funny business)
29.             //comment out return and see the error
30.             return;
31.         }
32.  
33.  
34.         ecb = ecbSystem.CreateCommandBuffer();
35.  
36.         //Entities.ForEach((VisualEffect visualEffect ) => {
37.         //    visualEffect.Play();  
38.         //})
39.         //    .WithoutBurst()
40.         //    .Run();
41.     }
42. }

 

Well, I found the bug in my code, I forgot to use the new entity as the reference.