title: Error: Failed to connect outlet from ... to (NSTextField): missing setter or instance variable
body: <p>Why does this code:</p>
  
  <pre><code>if Note1Math.stringValue == "" {         
          TxtFilled = 0
  
          }else{
  
          TxtFilled = 1
  
      }
  </code></pre>
  
  <p>give this error?: </p>
  
  <blockquote>
    <p>2015-06-18 20:20:17.633 Office[41763:430750] Failed to connect (Note1) outlet from (Office.ViewController) to (NSTextField): missing setter or instance variable.<br>
    fatal error: unexpectedly found nil while unwrapping an Optional value
    (lldb)</p>
  </blockquote>