Unity 3D Help: “Failed to Repackage Resources” and “Failed to convert classes into dex”

I have been having issues trying to build an APK file from Unity. I have These files in my Plugin folder That I assume may be causing the problem; play_services_ads.aar, play_services_ads_lite.aar, play_services_base.aar, play_services_basement.aar... whenever I remove one of those I assume are similar e.g, one of the ads and one of the base(play_services_ads.aar and play_services_base.aar for instance), I start getting Unable to repackage resources error. When I put back this files, I start getting errors about unity being Unable to convert classes into Dex format... see below;

 CommandInvokationFailure: Unable to convert classes into dex format. 
 
 See the Console for details.
 /Library/Java/JavaVirtualMachines/jdk1.8.0_77.jdk/Contents/Home/bin/java -Xmx2048M -Dcom.android.sdkmanager.toolsdir="/Users/../Library/And/Android/sdk/tools" -Dfile.encoding=UTF8 -jar "/Applications/Unity/PlaybackEngines/AndroidPlayer/Tools/sdktools.jar" -
 
 stderr[
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zznm;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zznn;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzno;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzno$zza;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zznp;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zznq;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzqi;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzqi$zza;
 Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/zzqj;
 9 errors; aborting
 ]
 stdout[
 processing archive /Users/.../Desktop/Game/../Temp/StagingArea/android-libraries/ChartboostSDK/libs/./chartboost.jar...
 ignored resource META-INF/MANIFEST.MF
 processing com/chartboost/sdk/CBImpressionActivity.class...
 processing com/chartboost/sdk/CBImpressionActivity$1.class...
 processing com/chartboost/sdk/CBImpressionActivity$2.class...
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 processing com/chartboost/sdk/Chartboost.class...
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