Gradle: Error: more than one library with package name 'com.google.android.gms'

Question

What does this error message mean? I don\'t have duplicated packages in my project

Error:Execution failed for task \':SimpleReader:processDebugResourc

Answer 1

this is a problem with versions. if you have multiple dependencies of same package path ensure the versions are the same

compile 'com.google.android.gms:play-services-ads:8.4.0'
compile 'com.google.android.gms:play-services-gcm:8.4.0'