Swagger is endlessly loading but never getting the data (ASP.NET Core)

Just like what the title says, the swagger is only loading when I execute.

Since startup.cs was not in the project folder when I created, everything is in my program.cs:

using Microsoft.EntityFrameworkCore;
using Package.Interfaces;
using Package.Models;

var builder = WebApplication.CreateBuilder(args);

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


var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<OperationsContext>(x => x.UseSqlServer(connectionString));

builder.Services.AddScoped<IContentRepository, ContentRepository>();
builder.Services.AddScoped<IPackageRepository, PackageRepository>();

var app = builder.Build();


if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();

    // Enable middleware to serve generated Swagger as a JSON endpoint.
    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("v1/swagger.json", "MyAPI V1");
    });
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
});
app.Run();