Unable to convert classes into dex format!

Hello!
I have recently started to have this issue.
After i try to make an android build of my game i am getting the error “Unable to convert classes into dex format”. I made a little research into this problem and it seems that the problem is that 2 plugins are having some duplicates but i am unsure what i have to delete.
I am using Unity Ads and Google Play Games plugins.
Here is the full error log:

CommandInvokationFailure: Unable to
convert classes into dex format. See
the Console for details. C:\Program
Files\Java\jdk1.8.0_51\bin\java.exe
-Xmx2048M -Dcom.android.sdkmanager.toolsdir=“H:/Android
SDK/adt-bundle-windows-x86_64-20140702/sdk ools”
-Dfile.encoding=UTF8 -jar “C:/Program Files/Unity/Editor/Data/BuildTargetTools/AndroidPlayer\sdktools.jar”

stderr[

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException:
already added:
Lcom/google/games/bridge/BuildConfig;
at
com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:122)
at
com.android.dx.dex.file.DexFile.add(DexFile.java:161)
at
com.android.dx.command.dexer.Main.processClass(Main.java:732)
at
com.android.dx.command.dexer.Main.processFileBytes(Main.java:673)
at
com.android.dx.command.dexer.Main.access$300(Main.java:82)
at
com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:602)
at
com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
at
com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
at
com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
at
com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
at
com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
at
com.android.dx.command.dexer.Main.processOne(Main.java:632)
at
com.android.dx.command.dexer.Main.processAllFiles(Main.java:510)
at
com.android.dx.command.dexer.Main.runMonoDex(Main.java:279)
at
com.android.dx.command.dexer.Main.run(Main.java:245)
at
com.android.dx.command.dexer.Main.main(Main.java:214)
at
com.android.dx.command.Main.main(Main.java:106)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
java.lang.reflect.Method.invoke(Method.java:497)
at SDKMain.main(SDKMain.java:129) 1
error; aborting ] stdout[ processing
archive bin\classes.jar… processing
com/unity3d/player/a$1.class…
processing
com/unity3d/player/a$2.class…
processing
com/unity3d/player/a$a.class…
processing
com/unity3d/player/a.class…
processing
com/unity3d/player/b$1.class…
processing
com/unity3d/player/b$2.class…
processing
com/unity3d/player/b.class…
processing
com/unity3d/player/c.class…
processing
com/unity3d/player/d$1.class…
processing
com/unity3d/player/d$2.class…
processing
com/unity3d/player/d.class…
processing
com/unity3d/player/e.class…
processing
com/unity3d/player/f.class…
processing
com/unity3d/player/g.class…
processing
com/unity3d/player/h.class…
processing
com/unity3d/player/i.class…
processing
com/unity3d/player/j$1.class…
processing
com/unity3d/player/j$2$1$1.class…
processing
com/unity3d/player/j$2$1.class…
processing
com/unity3d/player/j$2.class…
processing
com/unity3d/player/j.class…
processing
com/unity3d/player/k$1.class…
processing
com/unity3d/player/k.class…
processing
com/unity3d/player/l.class…
processing
com/unity3d/player/m.class…
processing
com/unity3d/player/n$1.class…
processing
com/unity3d/player/n.class…
processing
com/unity3d/player/NativeLoader.class…
processing
com/unity3d/player/o.class…
processing
com/unity3d/player/ReflectionHelper$1.class…
processing
com/unity3d/player/ReflectionHelper$a.class…
processing
com/unity3d/player/ReflectionHelper.class…
processing
com/unity3d/player/p.class…
processing
com/unity3d/player/q$1.class…
processing
com/unity3d/player/q$2.class…
processing
com/unity3d/player/q$3.class…
processing
com/unity3d/player/q.class…
processing
com/unity3d/player/r.class…
processing
com/unity3d/player/s.class…
processing
com/unity3d/player/UnityPlayer$1.class…
processing
com/unity3d/player/UnityPlayer$2.class…
processing
com/unity3d/player/UnityPlayer$3.class…
processing
com/unity3d/player/UnityPlayer$4.class…
processing
com/unity3d/player/UnityPlayer$5.class…
processing
com/unity3d/player/UnityPlayer$6.class…
processing
com/unity3d/player/UnityPlayer$7.class…
processing
com/unity3d/player/UnityPlayer$8.class…
processing
com/unity3d/player/UnityPlayer$9.class…
processing
com/unity3d/player/UnityPlayer$10.class…
processing
com/unity3d/player/UnityPlayer$11.class…
processing
com/unity3d/player/UnityPlayer$12$1.class…
processing
com/unity3d/player/UnityPlayer$12.class…
processing
com/unity3d/player/UnityPlayer$13.class…
processing
com/unity3d/player/UnityPlayer$14.class…
processing
com/unity3d/player/UnityPlayer$15.class…
processing
com/unity3d/player/UnityPlayer$16.class…
processing
com/unity3d/player/UnityPlayer$17.class…
processing
com/unity3d/player/UnityPlayer$18.class…
processing
com/unity3d/player/UnityPlayer$a.class…
processing
com/unity3d/player/UnityPlayer$b.class…
processing
com/unity3d/player/UnityPlayer$c.class…
processing
com/unity3d/player/UnityPlayer.class…
processing
com/unity3d/player/UnityPlayerActivity.class…
processing
com/unity3d/player/UnityPlayerNativeActivity.class…
processing
com/unity3d/player/UnityPlayerProxyActivity.class…
processing
com/unity3d/player/t.class…
processing
com/unity3d/player/u$1.class…
processing
com/unity3d/player/u.class…
processing
com/unity3d/player/WWW.class…
processing
org/fmod/FMODAudioDevice$a.class…
processing
org/fmod/FMODAudioDevice.class…
processing org/fmod/a.class…
processing
bitter/jnibridge/JNIBridge$a.class…
processing
bitter/jnibridge/JNIBridge.class…
processing
bin\classes.\com\google\android\gms\R$attr.class…
processing
bin\classes.\com\google\android\gms\R$color.class…
processing
bin\classes.\com\google\android\gms\R$drawable.class…
processing
bin\classes.\com\google\android\gms\R$id.class…
processing
bin\classes.\com\google\android\gms\R$integer.class…
processing
bin\classes.\com\google\android\gms\R$layout.class…
processing
bin\classes.\com\google\android\gms\R$raw.class…
processing
bin\classes.\com\google\android\gms\R$string.class…
processing
bin\classes.\com\google\android\gms\R$style.class…
processing
bin\classes.\com\google\android\gms\R$styleable.class…
processing
bin\classes.\com\google\android\gms\R.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$attr.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$color.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$drawable.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$id.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$integer.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$layout.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$raw.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$string.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$style.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R$styleable.class…
processing
bin\classes.\com\google\example\games\mainlibproj\R.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$attr.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$color.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$drawable.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$id.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$integer.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$layout.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$raw.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$string.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$style.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R$styleable.class…
processing
bin\classes.\com\PistanilaAdrian\ArcheryGame2D\R.class…
processing
bin\classes.\com\unity3d\ads\android\R$attr.class…
processing
bin\classes.\com\unity3d\ads\android\R$color.class…
processing
bin\classes.\com\unity3d\ads\android\R$drawable.class…
processing
bin\classes.\com\unity3d\ads\android\R$id.class…
processing
bin\classes.\com\unity3d\ads\android\R$integer.class…
processing
bin\classes.\com\unity3d\ads\android\R$layout.class…
processing
bin\classes.\com\unity3d\ads\android\R$raw.class…
processing
bin\classes.\com\unity3d\ads\android\R$string.class…
processing
bin\classes.\com\unity3d\ads\android\R$style.class…
processing
bin\classes.\com\unity3d\ads\android\R$styleable.class…
processing
bin\classes.\com\unity3d\ads\android\R.class…
processing archive
plugins.\android-support-v4.jar…
ignored resource META-INF/MANIFEST.MF
processing
android/support/annotation/IdRes.class…
processing
android/support/annotation/Keep.class…
processing
android/support/annotation/UiThread.class…
processing
android/support/annotation/AnyRes.class…
processing
android/support/annotation/CheckResult.class…
processing
android/support/annotation/FloatRange.class…
processing
android/support/annotation/ColorInt.class…
processing
android/support/annotation/BinderThread.class…
processing
android/support/annotation/RequiresPermission.class…
processing
android/support/annotation/RequiresPermission$Write.class…
processing
android/support/annotation/IntegerRes.class…
processing
android/support/annotation/AnimatorRes.class…
processing
android/support/annotation/MenuRes.class…
processing
android/support/annotation/IntDef.class…
processing
android/support/annotation/CallSuper.class…
processing
android/support/annotation/XmlRes.class…
processing
android/support/annotation/WorkerThread.class…
processing
android/support/annotation/FractionRes.class…
processing
android/support/annotation/StringRes.class…
processing
android/support/annotation/StringDef.class…
processing
android/support/annotation/VisibleForTesting.class…
processing
android/support/annotation/PluralsRes.class…
processing
android/support/annotation/TransitionRes.class…
processing
android/support/annotation/AnimRes.class…
processing
android/support/annotation/LayoutRes.class…
processing
android/support/annotation/ColorRes.class…
processing
android/support/annotation/Size.class…
processing
android/support/annotation/ArrayRes.class…
processing
android/support/annotation/IntRange.class…
processing
android/support/annotation/RawRes.class…
processing
android/support/annotation/Nullable.class…
processing
android/support/annotation/AttrRes.class…
processing
android/support/annotation/StyleableRes.class…
processing
android/support/annotation/NonNull.class…
processing
android/support/annotation/DimenRes.class…
processing
android/support/annotation/RequiresPermission$Read.class…
processing
android/support/annotation/DrawableRes.class…
processing
android/support/annotation/StyleRes.class…
processing
android/support/annotation/MainThread.class…
processing
android/support/annotation/InterpolatorRes.class…
processing
android/support/annotation/BoolRes.class…
processing
android/support/v4/app/TaskStackBuilder$SupportParentable.class…
processing
android/support/v4/app/DialogFragment$DialogStyle.class…
processing
android/support/v4/app/NotificationCompat$Action$Builder.class…
processing
android/support/v4/app/NotificationCompat$NotificationCompatImplKitKat.class…
processing
android/support/v4/app/NotificationCompatJellybean.class…
processing
android/support/v4/app/NotificationCompatGingerbread.class…
processing
android/support/v4/app/ShareCompat$IntentReader.class…
processing
android/support/v4/app/NotificationCompat$NotificationCompatImplJellybean.class…
processing
android/support/v4/app/INotificationSideChannel.class…
processing
android/support/v4/app/FragmentManager$OnBackStackChangedListener.class…
processing
android/support/v4/app/NotificationCompat$BigPictureStyle.class…
processing
android/support/v4/app/BackStackRecord.class…
processing
android/support/v4/app/NotificationCompat$Action$WearableExtender.class…
processing
android/support/v4/app/TaskStackBuilder$TaskStackBuilderImplJellybean.class…
processing
android/support/v4/app/NotificationCompatHoneycomb.class…
processing
android/support/v4/app/RemoteInputCompatBase$RemoteInput.class…
processing
android/support/v4/app/FragmentTransaction.class…
processing
android/support/v4/app/ActionBarDrawerToggle$ActionBarDrawerToggleImplHC.class…
processing
android/support/v4/app/ShareCompat$ShareCompatImplJB.class…
processing
android/support/v4/app/FragmentTransitionCompat21$1.class…
processing
android/support/v4/app/ActivityCompat$OnRequestPermissionsResultCallback.class…
processing
android/support/v4/app/ListFragment$2.class…
processing
android/support/v4/app/FragmentManagerImpl$5.class…
processing
android/support/v4/app/ActivityCompat$SharedElementCallback21Impl.class…
processing
android/support/v4/app/NotificationCompat$Action$1.class…
processing
android/support/v4/app/Fragment$SavedState$1.class…
processing
android/support/v4/app/ActionBarDrawerToggle$ActionBarDrawerToggleImpl.class…
processing
android/support/v4/app/BundleUtil.class…
processing
android/support/v4/app/NotificationCompat$CarExtender$UnreadConversation.class…
processing
android/support/v4/app/ActivityCompatApi23.class…
processing
android/support/v4/app/NotificationBuilderWithActions.class…
processing
android/support/v4/app/NotificationCompatSideChannelService$1.class…
processing
android/support/v4/app/NavUtils$NavUtilsImplBase.class…
processing
android/support/v4/app/NotificationManagerCompat$SideChannelManager.class…
processing
android/support/v4/app/ActivityCompat21.class…
processing
android/support/v4/app/NotificationManagerCompat$ImplIceCreamSandwich.class…
processing
android/support/v4/app/AppOpsManagerCompat23.class…
processing
android/support/v4/app/BackStackRecord$1.class…
processing
android/support/v4/app/FragmentTransitionCompat21$2.class…
processing
android/support/v4/app/TaskStackBuilderHoneycomb.class…
processing
android/support/v4/app/NotificationCompat$CarExtender$UnreadConversation$Builder.class…
processing
android/support/v4/app/FragmentTransitionCompat21$EpicenterView.class…
processing
android/support/v4/app/ShareCompat$IntentBuilder.class…
processing
android/support/v4/app/FragmentTransitionCompat21.class…
processing
android/support/v4/app/NavUtils.class…
processing
android/support/v4/app/NotificationCompat$Extender.class…
processing
android/support/v4/app/ListFragment$1.class…
processing
android/support/v4/app/BackStackRecord$2.class…
processing
android/support/v4/app/ActionBarDrawerToggle$SlideDrawable.class…
processing
android/support/v4/app/NotificationCompat$WearableExtender.class…
processing
android/support/v4/app/ActivityCompatJB.class…
processing
android/support/v4/app/ActivityManagerCompatKitKat.class…
processing
android/support/v4/app/RemoteInputCompatBase$RemoteInput$Factory.class…
processing
android/support/v4/app/NotificationCompat$CarExtender.class…
processing
android/support/v4/app/RemoteInput$ImplApi20.class…
processing
android/support/v4/app/INotificationSideChannel$Stub$Proxy.class…
processing
android/support/v4/app/ActionBarDrawerToggleJellybeanMR2.class…
processing
android/support/v4/app/NotificationCompat$NotificationCompatImplHoneycomb.class…
processing
android/support/v4/app/FragmentState.class…
processing
android/support/v4/app/RemoteInput$ImplBase.class…
processing
android/support/v4/app/ShareCompat$ShareCompatImplICS.class…
processing
android/support/v4/app/FragmentController.class…
processing
android/support/v4/app/NotificationCompatSideChannelService.class…
processing
android/support/v4/app/TaskStackBuilder$TaskStackBuilderImplBase.class…
processing
android/support/v4/app/BaseFragmentActivityHoneycomb.class…
processing
android/support/v4/app/ActionBarDrawerToggle$DelegateProvider.class…
processing
android/support/v4/app/FragmentManagerState$1.class…
processing
android/support/v4/app/FragmentTabHost$SavedState.class…
processing
android/support/v4/app/ActivityCompat21$SharedElementCallback21.cla truncated>

and also:

Error building Player:
CommandInvokationFailure: Unable to
convert classes into dex format. See
the Console for details. C:\Program
Files\Java\jdk1.8.0_51\bin\java.exe
-Xmx2048M -Dcom.android.sdkmanager.toolsdir=“H:/Android
SDK/adt-bundle-windows-x86_64-20140702/sdk ools”
-Dfile.encoding=UTF8 -jar “C:/Program Files/Unity/Editor/Data/BuildTargetTools/AndroidPlayer\sdktools.jar”

stderr[

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException:
already added:
Lcom/google/games/bridge/BuildConfig;
at
com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:122)
at
com.android.dx.dex.file.DexFile.add(DexFile.java:161)
at
com.android.dx.command.dexer.Main.processClass(Main.java:732)
at
com.android.dx.command.dexer.Main.processFileBytes(Main.java:673)
at
com.android.dx.command.dexer.Main.access$300(Main.java:82)
at
com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:602)
at
com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
at
com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
at
com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
at
com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
at
com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
at
com.android.dx.command.dexer.Main.processOne(Main.java:632)
at
com.android.dx.command.dexer.Main.processAllFiles(Main.java:510)
at
com.android.dx.command.dexer.Main.runMonoDex(Main.java:279)
at
com.android.dx.command.dexer.Main.run(Main.java:245)
at
com.android.dx.command.dexer.Main.main(Main.java:214)
at
com.android.dx.command.Main.main(Main.java:106)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
java.lang.reflect.Method.invoke(Method.java:497)
at SDKMain.main(SDKMain.java:129) 1
error; aborting ] stdout[ processing
archive bin\classes.jar… processing
com/unity3d/player/a$1.class…
processing
com/unity3d/player/a$2.class…
processing
com/unity3d/player/a$a.class…
processing
com/unity3d/player/a.class…
processing
com/unity3d/player/b$1.class…
processing
com/unity3d/player/b$2.class…
processing
com/unity3d/player/b.class…
processing
com/unity3d/player/c.class…
processing
com/unity3d/player/d$1.class…
processing
com/unity3d/player/d$2.class…
processing
com/unity3d/player/d.class…
processing
com/unity3d/player/e.class…
processing
com/unity3d/player/f.class…
processing
com/unity3d/player/g.class…
processing
com/unity3d/player/h.class…
processing
com/unity3d/player/i.class…
processing
com/unity3d/player/j$1.class…
processing
com/unity3d/player/j$2$1$1.class…
processing
com/unity3d/player/j$2$1.class…
processing
com/unity3d/player/j$2.class…
processing
com/unity3d/player/j.class…
processing
com/unity3d/player/k$1.class…
processing
com/unity3d/player/k.class…
processing
com/unity3d/player/l.class…
processing
com/unity3d/player/m.class…
processing
com/unity3d/player/n$1.class…
processing
com/unity3d/player/n.class…
processing
com/unity3d/player/NativeLoader.class…
processing
com/unity3d/player/o.class…
processing
com/unity3d/player/ReflectionHelper$1.class…
processing
com/unity3d/player/ReflectionHelper$a.class…
processing
com/unity3d/player/ReflectionHelper.class…
processing
com/unity3d/player/p.class…
processing
com/unity3d/player/q$1.class…
processing
com/unity3d/player/q$2.class…
processing
com/unity3d/player/q$3.class…
processing
com/unity3d/player/q.class…
processing
com/unity3d/player/r.class…
processing
com/unity3d/player/s.class…
processing
com/unity3d/player/UnityPlayer$1.class…
processing
com/unity3d/player/UnityPlayer$2.class…
processing
com/unity3d/player/UnityPlayer$3.class…
processing
com/unity3d/player/UnityPlayer$4.class…
processing
com/unity3d/player/UnityPlayer$5.class…
processing
com/unity3d/player/UnityPlayer$6.class…
processing
com/unity3d/player/UnityPlayer$7.class…
processing
com/unity3d/player/UnityPlayer$8.class…
processing
com/unity3d/player/UnityPlayer$9.class…
processing
com/unity3d/player/UnityPlayer$10.class…
processing
com/unity3d/player/UnityPlayer$11.class…
processing
com/unity3d/player/UnityPlayer$12$1.class…
processing
com/unity3d/player/UnityPlayer$12.class…
processing
com/unity3d/player/UnityPlayer$13.class…
processing
com/unity3d/player/UnityPlayer$14.class…
processing
com/unity3d/player/UnityPlayer$15.class…
processing
com/unity3d/player/UnityPlayer$16.class…
processing
com/unity3d/player/UnityPlayer$17.class…
processing
com/unity3d/player/UnityPlayer$18.class…
processing
com/unity3d/player/UnityPlayer$a.class…
processing
com/unity3d/player/UnityPlayer$b.class…
processing
com/unity3d/player/UnityPlayer$c.class…
processing
com/unity3d/player/UnityPlayer.class…
processing
com/unity3d/player/UnityPlayerActivity.class…
processing
com/unity3d/player/UnityPlayerNativeActivity.class…
processing
com/unity3d/player/UnityPlayerProxyActivity.class…
processing
com/unity3d/player/t.class…
processing
com/unity3d/player/u$1.class…
processing
com/unity3d/player/u.class…
processing
com/unity3d/player/WWW.class…
processing
org/fmod/FMODAudioDevice$a.class…
processing
org/fmod/FMODAudioDevice.class…
processing org/fmod/a.class…
processing
bitter/jnibridge/JNIBridge$a.class…
processing
bitter/jnibridge/JNIBridge.class…
processing
bin\classes.\com\google\android\gms\R$attr.class…
processing
bin\classes.\com\google\android\gms\R$color.class…
processing
bin\classes.\com\google\android\gms\R$drawable.class…
processing
bin\classes.\com\google\android\gms\R$id.class…
processing
bin\classes.\com\google\android\gms\R$integer.class…
processing
bin\classes.\com\google\android\gms\R$layout.class…
processing
bin\classes.\com\google\android\gms\R$raw.class…
processing
bin\classes.\com\google\android\gms\R$string.class…
processing
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android/support/v4/app/ActivityCompat21$Shar truncated>

Please help me! Thank you!

I have the same problem, but it started after updating to 5.2.
Still looking what the problem is…
However mine seems to come from a different file:

java.lang.IllegalArgumentException: already added: Lcom/applifier/impact/android/ApplifierImpact;
at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:122)
at com.android.dx.dex.file.DexFile.add(DexFile.java:161)