Jar Conflict

Hi,

I'm trying to integrate to different plugins in my project. The first one is Google Analytics, and the other is one that use google_play_services. The problem is that Google Analytics use some clases that are included in google_play_services so I'm having this error when I'm trying to build.

 Error building Player: CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details.
 /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/java -Xmx2048M -Dcom.android.sdkmanager.toolsdir="/Users/Javier/Documents/android-sdk-macosx/tools" -Dfile.encoding=UTF8 -jar "/Applications/Unity464/Unity.app/Contents/BuildTargetTools/AndroidPlayer/sdktools.jar" -
 
 stderr[
 
 UNEXPECTED TOP-LEVEL EXCEPTION:
 java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/analytics/internal/Command;

What can I do to avoid this conflict? Can I merge the to Jars in some way? Thank you.