A error with my event..

TestTwo.razor

@using Sharpy
@using BackendAPI.Objects
@using BackendProxy
@using BackendAPI
@using BackendAPI.Events
@using BackendAPI.Pages.Shared
@using System.Diagnostics
@using Microsoft.JSInterop
@inject IJSRuntime JSRuntime
@namespace BlazorServerSample.Pages




@code{

    protected override void OnAfterRender(bool firstRender)
    {
        
        //setInterval(atualizarDefinicao, 3000);
        Wrapper.events.On("deckitemsingleclearpacket", (e) =>
        {
            Debug.WriteLine("CLEANIG PACKET..");
            // Cast event argrument to your event object
            var obj = (DeckItemClearSinglePacket)e;




            // ClearBackground(obj.SlotID);

            JSRuntime.InvokeAsync<int>(
                 "ClearBackground",
                 obj.SlotID);


        });

        Wrapper.events.On("deckitemsinglechangepacket", (e) =>
        {
            Debug.WriteLine("CHANGE PACKET..");
            // Cast event argrument to your event object
            var obj = (DeckItemSinglePacket)e;


            // ClearBackground(obj.SlotID);


            JSRuntime.InvokeAsync<int>(
                             "ClearBackground",
                             obj.ImageSlot);


        });
    }

}