title: Enabling Proguard fail with Can't process class [org/fmod/FMODAudioDevice.class]
body: <p>I have the classes.jar from Unity3d included in my libs folder of Project in Android Studio. 
  If i enable proguard, i could not build it.
  minifyEnabled true</p>
  
  <p>my build.grade got dependencies </p>
  
  <pre><code>            dependencies {
              compile 'com.google.android.gms:play-services:+'
              compile files('libs/classes.jar')
              }
  </code></pre>
  
  <p>proguard-rules file has</p>
  
  <pre><code>            -dontwarn org.fmod.**
              -keep  class com.unity3d.** { *; }
              -keep  class org.fmod.** { *; }
              -keepclassmembers   class com.unity3d.player.** { *; }
              -keepclassmembers   class org.fmod.** { *; }
              -libraryjars !libs/classes.jar(!org/fmod/FMODAudioDevice.class)
  </code></pre>
  
  <p>check the proguard website to have -libraryjars with !. Did not help as well.</p>
  
  <p>Following is the build error. </p>
  
  <p>Error:Execution failed for task ':Android:proguardRelease'.</p>
  
  <blockquote>
    <p>java.io.IOException: Can't read [/Users/me/after_android_studio/src/libs/classes.jar(;;;;;;!META-INF/MANIFEST.MF)] (Can't process class [org/fmod/FMODAudioDevice.class] (256))</p>
  </blockquote>
  
  <p>I did my search for similar issue. But i could not read the following URLs.</p>
  
  <p>unresolvedlibraryclassmember</p>
  
  <p><a href="http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass" rel="nofollow">http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass</a></p>
  
  <p><a href="http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedlibraryclassmember" rel="nofollow">http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedlibraryclassmember</a></p>