title: What causes this error? The TargetControlID of <CheckBoxControlName> is not valid. The value cannot be null or empty
body: <p>I have searched on the net for this error, but there doesn't appear to be alot on it.</p>
  
  <pre><code>The TargetControlID of 'CheckBoxControlName' is not valid. The value cannot be null or empty.
  </code></pre>
  
  <p>Does anyone know of the main causes for this error?</p>