Proguard returned with error code 1. See console

I am receiving this exception while creation of signed apk of my application.

I have 5 library projects added to my project as well.

Any hint how to resolve this issue?

Here is my config file:

-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 * extends android.app.backup.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

-keepclasseswithmembernames class * {
    native <methods>;
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}

-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

and here is the exception in console.

    [2012-11-03 16:20:10 - ] Proguard returned with error code 1. See console
[2012-11-03 16:20:10 - ] Note: there were 12 duplicate class definitions.
[2012-11-03 16:20:10 - ] Warning: org.mockito.cglib.transform.AbstractProcessTask: can't find superclass or interface org.apache.tools.ant.Task
[2012-11-03 16:20:10 - ] Warning: library class android.test.AndroidTestCase extends or implements program class junit.framework.