I am trying to check if AppRoles exit in the database and if not create AppRoles as show below.
However, I got System.InvalidOperationException: ‘Cannot resolve scoped service ‘Microsoft.AspNetCore.Identity.RoleManager`1[Microsoft.AspNetCore.Identity.IdentityRole]’ from root provider.’ exception when i built the app

using (var serviceScope = app.Services.CreateScope()) { 
    var services = serviceScope.ServiceProvider;
    var dbContext = services.GetRequiredService<AppDbContext>();
    dbContext.Database.EnsureCreated();


    var roleManager = app.Services.GetRequiredService<RoleManager<IdentityRole>>();

    if (! await roleManager.RoleExistsAsync(AppRoles.User))
    {
        await roleManager.CreateAsync(new IdentityRole(AppRoles.User));
    }
    if (! await roleManager.RoleExistsAsync(AppRoles.Editor))
    {
        await roleManager.CreateAsync(new IdentityRole(AppRoles.Editor));
    }
    if (!await roleManager.RoleExistsAsync(AppRoles.Administrator))
    { 
        await roleManager.CreateAsync(new IdentityRole(AppRoles.Administrator));
    }
}

I expect the roles to created if the roles does not exit in the DB already