title: visual studio 2015 not clearing error list after successful build
body: <p>Often when I am working on a project in Visual Studio 2015 I will be fixing build errors. I will see the errors and then figure out the problem, make changes to the code, save and build again.</p>
  
  <p>The build will be successful as indicated in the build output window.</p>
  
  <pre><code> ========== Build: 18 succeeded, 0 failed, 0 up-to-date, 1 skipped ==========
  </code></pre>
  
  <p>But when I look at the error list, the errors are still there.</p>
  
  <p><a href="https://i.stack.imgur.com/ouU3J.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ouU3J.png" alt="enter image description here"></a>
  Why is this error showing up if the build worked?</p>
  
  <p>Edit:<br>
  @MethodMan request the source of the error. It is an actual valid error from within the test project.</p>
  
  <pre><code>    public void GetCustomerStatusInfoReportTest()
      {
          ReportManager target = new ReportManager();
          List&lt;GetCustomerStatusInfoResult&gt; actual;
  
          int resultCount;
          actual = target.GetCustomerStatusInfoReport(1, DateTime.UtcNow.AddMonths(-3), DateTime.UtcNow, null, null, null, null, null);
          resultCount = actual.Count;
          Assert.IsTrue(resultCount &gt; 0);
      }
  </code></pre>