gradle - can't generate signed APK from Android studio "Execution failed for task ':packageRelease'" -


i using android studio 1.2.2 , tried generate apk proguard setting. can't , got below error message.

"execution failed task ':packagerelease'.

unable compute hash of /users/documents/projectx/app/build/intermediates/classes-proguard/release/classes.jar "

the proguard setting simple. 

-dontshrink -dontoptimize -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -dontpreverify -verbose

and gradle file below. 

apply plugin: 'com.android.application' apply plugin: 'com.google.gms.google-services'  android {     compilesdkversion "google inc.:google apis:22"     buildtoolsversion "21.1.2"      defaultconfig {         applicationid "com.bientus.cirque.sansotong"         minsdkversion 15         targetsdkversion 22         versioncode 1         versionname "1.0" //        multidexenabled true     }     buildtypes {         debug {             debuggable true         }          release {             minifyenabled true             //proguardfiles 'proguard-project.txt', 'proguard.cfg'             //proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-project.txt', 'proguard.cfg'             proguardfiles 'proguard-project.txt'         }     } }  dependencies {         compile filetree(dir: 'libs', include: ['*.jar'])         compile 'com.android.support:appcompat-v7:22.0.0'         compile "com.google.android.gms:play-services:7.5.0" //    compile 'com.android.support:multidex:1.0.0' }  buildscript {     repositories { //        mavencentral()         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:1.2.3'         classpath 'com.google.gms:google-services:1.3.0-beta1'     } }

can give idea or thought? thank much!

just add project's proguard-rules:

-keep public class com.google.android.gms.** -dontwarn com.google.android.gms.**

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