title: Selenium Nunit addin install exception
body: <p>I don't have enough rep to comment, so I am posting a question here. I read this question <a href="https://stackoverflow.com/questions/11441430/get-list-of-failing-tests-from-nunit?answertab=votes#tab-top">Get list of failing tests from Nunit</a>. I am trying to implement the nunit addin, I used this code: </p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using NUnit.Framework;
  using NUnit.Core.Extensibility;
  
  namespace NunitAddin
  {
      [NUnitAddinAttribute(Type = ExtensionType.Core,
         Name = "addin",
         Description = "addin")]
      public class NunitAddin : IAddin
      {
          public bool Install(IExtensionHost host)
          {
              IExtensionPoint listeners = host.GetExtensionPoint("EventListeners");
              if (listeners == null)
                  return false;
  
              listeners.Install(this);
              return true;
          }
          public void TestStarted(NUnit.Core.TestName testName)
          {
          }
  
          public void TestFinished(NUnit.Core.TestResult result)
          {
  
          }
          public void RunStarted(NUnit.Core.TestName testName)
          {
          }
  
          public void RunFinished(NUnit.Core.TestResult result)
          {
          }
  
          public void UnhandledException(Exception exception)
          {
          }
  
          public void TestOutput(NUnit.Core.TestOutput testOutput)
          {
          }
  
  
      }
  }
  </code></pre>
  
  <p>But when I call it using </p>
  
  <p><code>var addin = new NunitAddin.NunitAddin();</code></p>
  
  <pre><code>var a = addin.Install(CoreExtensions.Host);
  </code></pre>
  
  <p>I get an error </p>
  
  <blockquote>
    <p>NunitAddin.NunitAddin is not {0} extension point</p>
  </blockquote>
  
  <p>on </p>
  
  <pre><code> listeners.Install(this);
  </code></pre>
  
  <p>Does anyone know how to solve this problem?</p>