Getting 'ambiguous call' error/warning in ConfigureServices MVC - asp.net

Question

I am learning ASP.NET and while somewhere I needed this part a few months back ( paused after that) it shows error/warning now. It is a .NET Core app very very basic. I know nothing about the error
See the source code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
namespace WebApplication1
{
public class MyOptions
{
public string color { get; set; }
public string welcomestring { get; set; }
}
public class Startup
{
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
if (env.IsDevelopment())
{
builder.AddUserSecrets();
}
if (env.IsDevelopment())
{
// This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
builder.AddApplicationInsightsSettings(developerMode: true);
}
Configuration = builder.Build();
}
public IConfigurationRoot Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.Configure<MyOptions>(Configuration);
var foo = Configuration["welcomestring"];
Console.WriteLine(foo);
// Add framework services.
services.AddApplicationInsightsTelemetry(Configuration);
services.AddMvc();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
app.UseApplicationInsightsRequestTelemetry();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseBrowserLink();
}
else
{
app.UseExceptionHandler("/Home/Error");
}
app.UseApplicationInsightsExceptionTelemetry();
app.UseStaticFiles();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
}
}
Screenshot of error:

Answer 1

give complete name of object with namespace
example
Microsoft.Extensions.DependencyInjection.OptionConfigurationServiceCollectionExtension
or put your cursor at Configure<MyOptions>
and ALT + SHIFT + F10
and select your model.