Weak Reference issue
<p>My App uses CoreAudio and CoreVideo frameworks (supported in iOS4 or later). Now I want my app to be run in device 3 or later. For that i have made core audio and core video frame work
to Weak Reference. but it is still giving same problem. </p>

<pre><code>dyld: Symbol not found: _OBJC_CLASS_$_AVCaptureDevice
  Referenced from: /var/mobile/Applications/67EDB406-FBEF-4FA4-8B6A-752CD9E3DA31/TescoClubCard.app/TescoClubCard
  Expected in: /System/Library/Frameworks/AVFoundation.framework/AVFoundation
</code></pre>
