title: NUnit error: the test case source could not be found
body: <p>This is quite simple but annoying behavior I am running into with NUnit:</p>
  
  <p>I have one test like this:</p>
  
  <pre><code>   static string[] EvenStr = new string[] { "1", "2", "3", "4" };
  
     [Test, TestCaseSource("EvenStr")]
     public void TestMethod(string num)
     {
        Assert.IsTrue( 1 == 1 );
     }
  </code></pre>
  
  <p>When I run it I see this:</p>
  
  <pre><code>    One or more child tests had errors Exception doesn't have a stacktrace
  
      test case source could not be found
  </code></pre>
  
  <p>I use NUnit 3.10.1 and .net 4.5</p>
  
  <p>Does anyone have any idea what is going on and why?</p>