title: Automatic Reference Counting: Pointer to non-const type 'NSError *' with no explicit ownership
body: <p>In updating some of my code to be in compatible with the iOS 5 SDK, I attempted to refactor my code by using "Convert to Objective-C ARC" in Xcode and received an error.  The error occurs on an instance variable in my .h file.</p>
  
  <pre><code>NSError **_error;
  </code></pre>
  
  <p>The error says "Pointer to non-const type 'NSError *' with no explicit ownership."  How might I fix this?</p>