title: Objective C:Object Deallocated while key value observers were still registered with it
body: <p>I am hitting the below error after I added 2 additional fields to my core data model.</p>
  
  <pre><code>CarPark_CarPark_ was deallocated while key value observers were still registered with it. Observation info was leaked, and may even become mistakenly attached to some other object. 
  Set a breakpoint on NSKVODeallocateBreak to stop here in the debugger. 
  Here's the current observation info:
  &lt;NSKeyValueObservationInfo 0x1b6510&gt; (
  &lt;NSKeyValueObservance 0x19b210: Observer: 0x1a8cf0, Key path: coordinate, 
  Options: &lt;New: NO, Old:     NO, Prior: YES&gt; Context: 0x0, Property: 0x1b7e00&gt;
  )
  </code></pre>
  
  <p>I am a little lost on what to do next. Any guidance on this will be greatly greatly appreciated! Please let me know what other information is required.</p>