java - Gradle duplicate entries : build failed -

i running issue everytime when add new module app time not able resolve @ all. sick , tired of not friendly messages , tools of gradle. please help: if need dependencies output let me know - it's big :(

error: :app:transformclasseswithjarmergingfordebug failed  failure: build failed exception.  * went wrong: execution failed task ':app:transformclasseswithjarmergingfordebug'. 

com.android.build.api.transform.transformexception: java.util.zip.zipexception: duplicate entry: com/google/appengine/tools/appstats/inter nalprotos$1.class

here 4 gradle files:

top level gradle:

buildscript { repositories {     jcenter()     mavencentral()  } dependencies {     classpath 'com.android.tools.build:gradle:1.5.0'     classpath 'com.jakewharton.hugo:hugo-plugin:1.2.1'     classpath 'com.google.gms:google-services:1.5.0-beta2'     // note: not place application dependencies here; belong     // in individual module build.gradle files } }  allprojects { repositories {     jcenter()     mavencentral()     } } 

app gradle:

apply plugin: 'com.android.application' apply plugin: 'hugo'   android { compilesdkversion 23 buildtoolsversion "23.0.1"  defaultconfig {     applicationid "com.app.myapp"     minsdkversion 15     targetsdkversion 23     versioncode 1     multidexenabled true     versionname "1.0" }  buildtypes {     release {         minifyenabled false         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'     } }  compileoptions {     sourcecompatibility javaversion.version_1_7     targetcompatibility javaversion.version_1_7 }  } apply plugin: 'com.google.gms.google-services'  dependencies { compile filetree(include: ['*.jar'], dir: 'libs') compile files('libs/nineoldandroids-2.4.0.jar') compile 'com.android.support:appcompat-v7:23.1.1' compile 'com.google.android.gms:play-services:8.3.0' compile 'com.android.support:cardview-v7:23.1.1' compile 'com.android.support:design:23.1.1' compile 'com.android.support:gridlayout-v7:23.1.1' compile 'com.android.support:mediarouter-v7:23.1.1' compile 'com.android.support:palette-v7:23.1.1' compile 'com.android.support:recyclerview-v7:23.1.1'  compile 'com.android.support:support-v13:23.1.1'  compile 'com.jakewharton:butterknife:7.0.1' compile 'com.mikhaellopez:circularimageview:2.1.1' compile 'com.cocosw:bottomsheet:0.+@aar' compile 'com.github.bumptech.glide:okhttp-integration:1.3.1'  compile 'com.google.android.gms:play-services-auth:8.3.0' compile 'com.google.android.gms:play-services-gcm:8.3.0' compile project(path: ':backend', configuration: 'android-endpoints')   compile project(path: ':commons') } 

backend gradle:

buildscript {     repositories {         jcenter()     }     dependencies {         classpath 'com.google.appengine:gradle-appengine-plugin:1.9.18'     } }  repositories {     jcenter(); }  apply plugin: 'java' apply plugin: 'war' apply plugin: 'appengine'  sourcecompatibility = javaversion.version_1_7 targetcompatibility = javaversion.version_1_7  dependencies {     appenginesdk 'com.google.appengine:appengine-java-sdk:1.9.18'     compile 'com.google.appengine:appengine-endpoints:1.9.18'     compile 'com.google.appengine:appengine-endpoints-deps:1.9.18'     compile 'javax.servlet:servlet-api:2.5'     compile 'com.ganyo:gcm-server:1.0.2'      compile project(path: ':commons') }  appengine {   downloadsdk = true   appcfg {     oauth2 = true   }   endpoints {     getclientlibsonbuild = true     getdiscoverydocsonbuild = true   } } 

commons gradle:

apply plugin: 'java'  dependencies {      compile 'com.googlecode.objectify:objectify:4.0b3'     compile 'com.google.code.gson:gson:2.5' } 

you can try

       compile 'com.android.support:multidex:1.0.1' 

it might you.