title: Error when exporting app that used Proguard
body: <p>I try to use Proguard in my app. I wrote this code in proguard.cfg file:</p>
  
  <pre><code>    -optimizationpasses 5
  -dontusemixedcaseclassnames
  -dontskipnonpubliclibraryclasses
  -dontpreverify
  -verbose
  -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
  -keep public class * extends android.app.Activity
  -keep public class * extends android.app.Application
  -keep public class * extends android.app.Service
  -keep public class * extends android.content.BroadcastReceiver
  -keep public class * extends android.content.ContentProvider
  -keep public class   Mp4ParserWrapper.** { *; }
  -keep public class com.android.vending.licensing.ILicensingService
  -keepclasseswithmembernames class * {
      native &lt;methods&gt;;
  }
  -keepclasseswithmembernames class * {
      public &lt;init&gt;(android.content.Context, android.util.AttributeSet);
  }
  -keepclasseswithmembernames class * {
      public &lt;init&gt;(android.content.Context, android.util.AttributeSet, int);
  }
  -keepclassmembers enum * {
      public static **[] values();
      public static ** valueOf(java.lang.String);
  }
  -keep class * implements android.os.Parcelable {
    public static final android.os.Parcelable$Creator *;
  }
  </code></pre>
  
  <p>When export app get <strong>can't find referenced class</strong> error .I search on the internet and add this line <strong>-keep public class   Mp4ParserWrapper.</strong> { *; }** to proguard file but don't solve problem .
  Console :</p>
  
  <pre><code>[2015-10-16 17:29:09 - nabege] Proguard returned with error code 1. See console
  [2015-10-16 17:29:09 - nabege] Warning: com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe: can't find referenced class javax.imageio.ImageIO
  [2015-10-16 17:29:09 - nabege] Warning: com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe: can't find referenced class javax.imageio.ImageIO
  [2015-10-16 17:29:09 - nabege] Warning: com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe: can't find referenced class java.awt.image.BufferedImage
  [2015-10-16 17:29:09 - nabege] Warning: com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe: can't find referenced class java.awt.image.BufferedImage
  [2015-10-16 17:29:09 - nabege] Warning: com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe: can't find referenced class java.awt.image.BufferedImage
  [2015-10-16 17:29:09 - nabege] Warning: com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe: can't find referenced class java.awt.image.BufferedImage
  [2015-10-16 17:29:09 - nabege]       You should check if you need to specify additional program jars.
  [2015-10-16 17:29:09 - nabege] Warning: there were 6 unresolved references to classes or interfaces.
  [2015-10-16 17:29:09 - nabege]          You may need to specify additional library jars (using '-libraryjars').
  [2015-10-16 17:29:09 - nabege] java.io.IOException: Please correct the above warnings first.
  [2015-10-16 17:29:09 - nabege]  at proguard.Initializer.execute(Initializer.java:321)
  [2015-10-16 17:29:09 - nabege]  at proguard.ProGuard.initialize(ProGuard.java:211)
  [2015-10-16 17:29:09 - nabege]  at proguard.ProGuard.execute(ProGuard.java:86)
  [2015-10-16 17:29:09 - nabege]  at proguard.ProGuard.main(ProGuard.java:492)
  [2015-10-16 17:29:09 - nabege] Picked up _JAVA_OPTIONS: -Xms256m -Xmx512m
  </code></pre>