Unable to convert classes in dex format

Hi everyone. In my project I've added the admob package, activated unity ads and added the facebook sdk 7.3. First I had a manifest problem(minsdk is 15 and your is 9) but I changed it in the manifest and the error has gone. Now I have this problem: CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details. C:/Program Files/Java/jdk1.8.0_60\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/stefano/AppData/Local/Android/android-sdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[ Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/android/vending/billing/IInAppBillingService; Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/android/vending/billing/IInAppBillingService$Stub; Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/android/vending/billing/IInAppBillingService$Stub$Proxy; 3 errors; aborting ] stdout[ processing archive C:\Users\stefano\Documents\Flappy Balls\Temp\StagingArea\android-libraries\GoogleMobileAdsPlugin\libs.\in-app-billing-service-aidl.jar... ignored resource META-INF/ ignored resource META-INF/MANIFEST.MF ignored resource com/ ignored resource com/android/ ignored resource com/android/vending/ ignored resource com/android/vending/billing/ processing com/android/vending/billing/IInAppBillingService.class... processing com/android/vending/billing/IInAppBillingService$Stub.class... processing com/android/vending/billing/IInAppBillingService$Stub$Proxy.class... ignored resource com/google/ ignored resource com/google/unity/ ignored resource com/google/unity/billingaidl/ processing com/google/unity/billingaidl/BuildConfig.class... processing archive C:\Users\stefano\Documents\Flappy Balls\Temp\StagingArea\android-libraries\GoogleMobileAdsPlugin\libs.\unity-plugin-library.jar... ignored resource META-INF/ ignored resource META-INF/MANIFEST.MF ignored resource com/ ignored resource com/google/ ignored resource com/google/unity/ processing com/google/unity/BuildConfig.class... ignored resource com/google/unity/ads/ processing com/google/unity/ads/Banner.class... processing com/google/unity/ads/Banner$1.class... processing com/google/unity/ads/Banner$1$1.class... processing com/google/unity/ads/Banner$2.class... processing com/google/unity/ads/Banner$3.class... processing com/google/unity/ads/Banner$4.class... processing com/google/unity/ads/Banner$5.class... processing com/google/unity/ads/Interstitial.class... processing com/google/unity/ads/Interstitial$1.class... processing com/google/unity/ads/Interstitial$1$1.class... processing com/google/unity/ads/Interstitial$2.class... processing com/google/unity/ads/Interstitial$3.class... processing com/google/unity/ads/Interstitial$4.class... processing com/google/unity/ads/PluginUtils.class... processing com/google/unity/ads/UnityAdListener.class... processing archive C:\Users\stefano\Documents\Flappy Balls\Temp\StagingArea\android-libraries\GooglePlay\bin\classes.jar... ignored resource META-INF/ ignored resource META-INF/MANIFEST.MF ignored resource com/ ignored resource com/android/ ignored resource com/android/vending/ ignored resource com/android/vending/billing/ processing com/android/vending/billing/IInAppBillingService.class... processing com/android/vending/billing/IInAppBillingService$Stub.class... processing com/android/vending/billing/IInAppBillingService$Stub$Proxy.class... ignored resource com/unity/ ignored resource com/unity/purchasing/ ignored resource com/unity/purchasing/googleplay/ processing com/unity/purchasing/googleplay/ActivityLauncher.class... processing com/unity/purchasing/googleplay/BillingServiceManager.class... processing com/unity/purchasing/googleplay/BillingServiceManager$1.class... processing com/unity/purchasing/googleplay/BillingServiceManager$1$1.class... processing com/unity/purchasing/googleplay/BillingServiceManager$1$2.class... processing com/unity/purchasing/googleplay/BillingServiceManager$2.class... processing com/unity/purchasing/googleplay/BillingServiceProcessor.class... processing com/unity/purchasing/googleplay/BuildConfig.class... processing com/unity/purchasing/googleplay/Consts.class... processing com/unity/purchasing/googleplay/Consts$PurchaseState.class... processing com/unity/purchasing/googleplay/Consts$ResponseCode.class... processing com/unity/purchasing/googleplay/GooglePlayBillingUnAvailableException.class... processing com/unity/purchasing/googleplay/GooglePlayPurchasing.class... processing com/unity/purchasing/googleplay/GooglePlayPurchasing$1.class... processing com/unity/purchasing/googleplay/GooglePlayPurchasing$2.class... processing com/unity/purchasing/googleplay/GooglePlayPurchasing$3.class... processing com/unity/purchasing/googleplay/GooglePlayPurchasing$4.class... processing com/unity/purchasing/googleplay/IActivityLauncher.class... processing com/unity/purchasing/googleplay/IBillingServiceManager.class... processing com/unity/purchasing/googleplay/IabException.class... processing com/unity/purchasing/googleplay/IabHelper.class... processing com/unity/purchasing/googleplay/IabHelper$1.class... processing com/unity/purchasing/googleplay/IabHelper$2.class... processing com/unity/purchasing/googleplay/IabHelper$3.class... processing com/unity/purchasing/googleplay/IabHelper$4.class... processing com/unity/purchasing/googleplay/IabHelper$OnConsumeFinishedListener.class... processing com/unity/purchasing/googleplay/IabHelper$OnConsumeMultiFinishedListener.class... processing com/unity/purchasing/googleplay/IabHelper$OnIabPurchaseFinishedListener.class... processing com/unity/purchasing/googleplay/IabHelper$OnIabSetupFinishedListener.class... processing com/unity/purchasing/googleplay/IabHelper$QueryInventoryFinishedListener.class... processing com/unity/purchasing/googleplay/IabResult.class... processing com/unity/purchasing/googleplay/Inventory.class... processing com/unity/purchasing/googleplay/Purchase.class... processing com/unity/purchasing/googleplay/PurchaseActivity.class... processing com/unity/purchasing/googleplay/PurchaseFailedEvent.class... processing com/unity/purchasing/googleplay/SkuDetails.class... processing archive C:\Users\stefano\Documents\Flappy Balls\Temp\StagingArea\android-libraries\common\bin\classes.jar... ignored resource META-INF/ ignored resource META-INF/MANIFEST.MF ignored resource com/ ignored resource com/unity/ ignored resource com/unity/purchasing/ processing com/unity/purchasing/BuildConfig.class... ignored resource com/unity/purchasing/common/ processing com/unity/purchasing/common/DelayedHandler.class... processing com/unity/purchasing/common/IDelayedExecutor.class... processing com/unity/purchasing/common/INativeStore.class... processing com/unity/purchasing/common/IStore.class... processing com/unity/purchasing/common/IStoreCallback.class... processing com/unity/purchasing/common/IUnityCallback.class... processing com/unity/purchasing/common/InitializationFailureReason.class... processing com/unity/purchasing/common/ProductDefinition.class... processing com/unity/purchasing/common/ProductDescription.class... processing com/unity/purchasing/common/ProductMetadata.class... processing com/unity/purchasing/common/ProductType.class... processing com/unity/purchasing/common/PurchaseFailedEvent.class... processing com/unity/purchasing/common/PurchaseFailureDescription.class... processing com/unity/purchasing/common/PurchaseFailureReason.class... processing com/unity/purchasing/common/SaneJSONObject.class... processing com/unity/purchasing/common/StoreDeserializer.class... processing com/unity/purchasing/common/UnityPurchasing.class... processing archive C:\Users\stefano\Documents\Flappy Balls\Temp\StagingArea\android-libraries\facebook-android-sdk-4.8.2\bin\classes.jar... ignored resource META-INF/ ignored resource META-INF/MANIFEST.MF ignored resource com/ ignored resource com/facebook/ processing com/facebook/AccessToken.class... processing com/facebook/AccessToken$1.class... processing com/facebook/AccessToken$2.class... processing com/facebook/AccessToken$AccessTokenCreationCallback.class... processing com/facebook/AccessToken$AccessTokenRefreshCallback.class... processing com/facebook/AccessTokenCache.class... processing com/facebook/AccessTokenCache$SharedPreferencesTokenCachingStrategyFactory.class... processing com/facebook/AccessTokenManager.class... processing com/facebook/AccessTokenManager$1.class... processing com/facebook/AccessTokenManager$2.class... processing com/facebook/AccessTokenManager$3.class... processing com/facebook/AccessTokenManager$4.class... processing com/facebook/AccessTokenManager$RefreshResult.class... processing com/facebook/AccessTokenSource.class... processing com/facebook/AccessTokenTracker.class... processing com/facebook/AccessTokenTracker$1.class... processing com/facebook/AccessTokenTracker$CurrentAccessTokenBroadcastReceiver.class... processing com/facebook/BuildConfig.class... processing com/facebook/CallbackManager.class... processing com/facebook/CallbackManager$Factory.class... processing com/facebook/FacebookActivity.class... processing com/facebook/FacebookAuthorizationException.class... processing com/facebook/FacebookBroadcastReceiver.class... processing com/facebook/FacebookButtonBase.class... processing com/facebook/FacebookButtonBase$1.class... processing com/facebook/FacebookCallback.class... processing com/facebook/FacebookContentProvider.class... processing com/facebook/FacebookDialog.class... processing com/facebook/FacebookDialogException.class... processing com/facebook/FacebookException.class... processing com/facebook/FacebookGraphResponseException.class... processing com/facebook/FacebookOperationCanceledException.class... processing com/facebook/FacebookRequestError.class... processing com/facebook/FacebookRequestError$1.class... processing com/facebook/FacebookRequestError$Category.class... processing com/facebook/FacebookRequestError$Range.class... processing com/facebook/FacebookSdk.class... processing com/facebook/FacebookSdk$1.class... processing com/facebook/FacebookSdk$2.class... processing com/facebook/FacebookSdk$3.class... processing com/facebook/FacebookSdk$4.class... processing com/facebook/FacebookSdk$InitializeCallback.class... processing com/facebook/FacebookSdkNotInitializedException.class... processing com/facebook/FacebookSdkVersion.class... processing com/facebook/FacebookServiceException.class... processing com/facebook/GraphRequest.class... processing com/facebook/GraphRequest$1.class... processing com/facebook/GraphRequest$2.class... processing com/facebook/GraphRequest$3.class... processing com/facebook/GraphRequest$4.class... processing com/facebook/GraphRequest$5.class... processing com/facebook/GraphRequest$6.class... processing com/facebook/GraphRequest$7.class... processing com/facebook/GraphRequest$Attachment.class... processing com/facebook/GraphRequest$Callback.class... processing com/facebook/GraphRequest$GraphJSONArrayCallback.class... processing com/facebook/GraphRequest$GraphJSONObjectCallback.class... processing com/facebook/GraphRequest$KeyValueSerializer.class... processing com/facebook/GraphRequest$OnProgressCallback.class... processing com/facebook/GraphRequest$ParcelableResourceWithMimeType.class... processing com/facebook/GraphRequest$ParcelableResourceWithMimeType$1.class... processing com/facebook/GraphRequest$Serializer.class... processing com/facebook/GraphRequestAsyncTask.class... processing com/facebook/GraphRequestBatch.class... processing com/facebook/GraphRequestBatch$Callback.class... processing com/facebook/GraphRequestBatch$OnProgressCallback.class... processing com/facebook/GraphResponse.class... processing com/facebook/GraphResponse$PagingDirection.class... processing com/facebook/HttpMethod.class... processing com/facebook/LegacyTokenHelper.class... processing com/facebook/LoggingBehavior.class... processing com/facebook/Profile.class... processing com/facebook/Profile$1.class... processing com/facebook/Profile$2.class... processing com/facebook/ProfileCache.class... processing com/facebook/ProfileManager.class... processing com/facebook/ProfileTracker.class... processing com/facebook/ProfileTracker$1.class... processing com/facebook/ProfileTracker$ProfileBroadcastReceiver.class... processing com/facebook/ProgressNoopOutputStream.class... processing com/facebook/ProgressOutputStream.class... processing com/facebook/ProgressOutputStream$1.class... processing com/facebook/RequestOutputStream.class... processing com/facebook/RequestProgress.class... processing com/facebook/RequestProgress$1.class... processing com/facebook/TestUserManager.class... processing com/facebook/TestUserManager$Mode.class... ignored resource com/facebook/appevents/ processing com/facebook/appevents/AppEventsConstants.class... processing com/facebook/appevents/AppEventsLogger.class... processing com/facebook/appevents/AppEventsLogger$1.class... processing com/facebook/appevents/AppEventsLogger$2.class... processing com/facebook/appevents/AppEventsLogger$3.class... processing com/facebook/appevents/AppEventsLogger$4.class... processing com/facebook/appevents/AppEventsLogger$5.class... processing com/facebook/appevents/AppEventsLogger$6.class... processing com/facebook/appevents/AppEventsLogger$7.class... processing com/facebook/appevents/AppEventsLogger$AccessTokenAppIdPair.class... processing com/facebook/appevents/AppEventsLogger$AccessTokenAppIdPair$SerializationProxyV1.class... processing com/facebook/appevents/AppEventsLogger$AppEvent.class... processing com/facebook/appevents/AppEventsLogger$AppEvent$SerializationProxyV1.class... processing com/facebook/appevents/AppEventsLogger$FlushBehavior.class... processing com/facebook/appevents/AppEventsLogger$FlushReason.class... processing com/facebook/appevents/AppEventsLogger$FlushResult.class... processing com/facebook/appevents/AppEventsLogger$FlushStatistics.class... processing com/facebook/appevents/AppEventsLogger$PersistedAppSessionInfo.class... processing com/facebook/appevents/AppEventsLogger$PersistedAppSessionInfo$1.class... processing com/facebook/appevents/AppEventsLogger$PersistedEvents.class... processing com/facebook/appevents/AppEventsLogger$SessionEventsState.class... processing com/facebook/appevents/FacebookTimeSpentData.class... processing com/facebook/appevents/FacebookTimeSpentData$1.class... processing com/facebook/appevents/FacebookTimeSpentData$SerializationProxyV1.class... processing com/facebook/appevents/FacebookTimeSpentData$SerializationProxyV2.class... ignored resource com/facebook/applinks/ processing com/facebook/applinks/AppLinkData.class... processing com/facebook/applinks/AppLinkData$1.class... processing com/facebook/applinks/AppLinkData$CompletionHandler.class... processing com/facebook/applinks/FacebookAppLinkResolver.class... processing com/facebook/applinks/FacebookAppLinkResolver$1.class... processing com/facebook/applinks/FacebookAppLinkResolver$2.class... ignored resource com/facebook/internal/ processing com/facebook/internal/AnalyticsEvents.class... processing com/facebook/internal/AppCall.class... processing com/facebook/internal/AppEventsLoggerUtility.class... processing com/facebook/internal/AppEventsLoggerUtility$1.class... processing com/facebook/internal/AppEventsLoggerUtility$GraphAPIActivityType.class... processing com/facebook/internal/AttributionIdentifiers.class... processing com/facebook/internal/AttributionIdentifiers$1.class... processing com/facebook/internal/AttributionIdentifiers$GoogleAdInfo.class... processing com/facebook/internal/AttributionIdentifiers$GoogleAdServiceConnection.class... processing com/facebook/internal/BoltsMeasurementEventListener.class... processing com/facebook/internal/BundleJSONConverter.class... processing com/facebook/internal/BundleJSONConverter$1.class... processing com/facebook/internal/BundleJSONConverter$2.class... processing com/facebook/internal/BundleJSONConverter$3.class... processing com/facebook/internal/BundleJSONConverter$4.class... processing com/facebook/internal/BundleJSONConverter$5.class... processing com/facebook/internal/BundleJSONConverter$6.class... processing com/facebook/internal/BundleJSONConverter$7.class... processing com/facebook/internal/BundleJSONConverter$Setter.class... processing com/facebook/internal/CallbackManagerImpl.class... processing com/facebook/internal/CallbackManagerIm

I searched on google and someone says to reimport all the package, others say to delete a specific jar file in the project. But I don't know where I can find the jar files of my project. What can I do? Thank you