No service for type 'Microsoft.AspNetCore.Identity.SignInManager When
<p>I am getting </p>

<blockquote>
  <p>InvalidOperationException: No service for type
  'Microsoft.AspNetCore.Identity.SignInManager
  1[Authorization.IdentityModels.ApplicationUser]' has been registered.</p>
</blockquote>

<p>when I run my ApsCore MVC website. </p>

<p>this are segments from my code:</p>

<p>ConfigureServices:</p>

<pre><code>services.AddDbContext&lt;ApplicationDbContext&gt;(options =&gt;
                        options.UseNpgsql(configuration["Data:DefaultConnection:ConnectionString"]));



services.AddIdentity&lt;ApplicationUser, IdentityRole&lt;Guid&gt;&gt;()
                    .AddEntityFrameworkStores&lt;ApplicationDbContext, Guid&gt;()
                    .AddDefaultTokenProviders();
</code></pre>

<p>Configure:</p>

<pre><code>app.UseIdentity();
</code></pre>

<p>ApplicationDbContext.cs</p>

<pre><code>public class ApplicationDbContext : IdentityDbContext&lt;ApplicationUser, IdentityRole&lt;Guid&gt;, Guid&gt; 
</code></pre>

<p>ApplicationUser.cs</p>

<pre><code> public class ApplicationUser : IdentityUser&lt;Guid&gt;
</code></pre>

<p>I will be very happy if you can help me.</p>