Hi I am trying to create a web app using angular and asp.net core 8 so i can authenticate the user with its github account and then show all the repo’s of the user on my platform but i am getting this error.

 Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
      An unhandled exception has occurred while executing the request.
      Microsoft.AspNetCore.Authentication.AuthenticationFailureException: An error was encountered while handling the remote login.
       ---> Microsoft.AspNetCore.Authentication.AuthenticationFailureException: The oauth state was missing or invalid.
         --- End of inner exception stack trace ---
         at Microsoft.AspNetCore.Authentication.RemoteAuthenticationHandler`1.HandleRequestAsync()
         at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

and here is my program.cs

using GithubActions.Server.Services;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.OAuth;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.Extensions.Options;

var builder = WebApplication.CreateBuilder(args);


builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme; // Add this line
    options.DefaultChallengeScheme = "GitHub";
})
.AddCookie(options =>
{
    options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
})
.AddOAuth("GitHub", options =>
{
    options.ClientId = "";
    options.ClientSecret = "";
    options.CallbackPath = "/auth/github/callback";
    options.AuthorizationEndpoint = "https://github.com/login/oauth/authorize";
    options.TokenEndpoint = "https://github.com/login/oauth/access_token";
    options.UserInformationEndpoint = "https://api.github.com/user";

    options.SaveTokens = true;
    options.StateDataFormat = new PropertiesDataFormat(
        DataProtectionProvider.Create(new DirectoryInfo(@"./")).CreateProtector("OAuth2State"));

    options.ClaimActions.MapJsonKey("urn:github:login", "login");
    options.ClaimActions.MapJsonKey("urn:github:avatar", "avatar_url");
});


builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(builder =>
    {
        builder.WithOrigins("http://localhost:4200") // Replace with your frontend URL
               .AllowAnyHeader()
               .AllowAnyMethod();
    });
});

builder.Services.AddDistributedMemoryCache(); // Required for session
builder.Services.AddSession(options =>
{
    options.Cookie.Name = ".AspNetCore.Session";
    options.IdleTimeout = TimeSpan.FromMinutes(30);
    options.Cookie.HttpOnly = true;
    options.Cookie.IsEssential = true;
});

builder.Services.AddHttpClient<GitHubService>();
builder.Logging.AddConsole().SetMinimumLevel(LogLevel.Debug);

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

app.UseDefaultFiles();
 // Add this before Authentication middleware

app.UseStaticFiles();
app.UseSession();
app.UseAuthentication();
app.UseAuthorization();
app.UseCors();


// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.MapFallbackToFile("/index.html");

app.Run();

when user login with github and then redirect the user back to app using “/auth/github/callback” i show the above error

and here is my controller

 [HttpGet("login")]
 public IActionResult Login()
 {
     return Challenge(new AuthenticationProperties { RedirectUri = "/auth/github/callback" }, "GitHub");
 }

 [HttpGet("github/callback")]
 public IActionResult Callback()
 {
     // Redirect to frontend after login
     return Redirect("http://localhost:4200"); // Replace with your frontend URL
 }

I want to solve this error please help me