Gradle assembleRelease doesn't work with ProGuard

Question

So my project seemed to break at random today, with the error apparently being something about being over 65K methods. After doing some research I realised it was time to use ProGuard and enable multiDex, which seemes to have made things worse. This is the error I get when I try create a release APK:

Error:Execution failed for task ':My-Project:proguardRelease'.

java.io.IOException: Can't write [C:\\Users\\User-PC\\AndroidStudioProjects\\MyProject\\My-Project\\build\\intermediates\\classes-proguard\\release\\classes.jar] (Can't read [C:\\Users\\User-PC\\AndroidStudioProjects\\MyProject\\My-Project\\libs\\bolts-android-1.2.0.jar(;;;;;;!META-INF/MANIFEST.MF)] (Duplicate zip entry [a/a.class == bolts-android-1.2.0.jar:bolts/AggregateException.class]))

and my build.gradle file looks like this:

apply plugin: 'com.android.application'
apply plugin: 'com.parse'

buildscript {
    repositories {
        mavenCentral()
        maven { url 'https://maven.parse.com/repo' }
    }
    dependencies {
        classpath 'com.parse.tools:gradle:1.+'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: 'Parse-*.jar')
    compile fileTree(include: 'ParseCrashReporting-*.jar', dir: 'libs')
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:multidex:1.0.0'
    compile 'com.parse.bolts:bolts-android:1.+'
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile 'com.google.android.gms:play-services:7.8.0'
    compile 'com.oguzdev:CircularFloatingActionMenu:1.0.2'
    compile 'com.android.support:cardview-v7:22.2.0'
    compile 'com.android.support:recyclerview-v7:22.2.0'
    compile 'com.github.dkharrat.nexusdialog:nexusdialog:0.2.0'
}

android {
    signingConfigs {
        config {
           // stuff
        }
    }
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion
    defaultConfig {
        applicationId "com.kusasa.saleboat"
        minSdkVersion 19
        targetSdkVersion 21
        versionCode 8
        versionName "1.0.7"
        // Enabling multidex support.
        multiDexEnabled true
    }
    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            res.srcDirs = ['res']
        }
    }
    productFlavors {
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          signingConfig signingConfigs.config
            debuggable false
        }
    }
}

I have tried cleaning and rebuilding the project several times, to no avail.

Answer 1

Well i think you get this error because you declare two dependencies of bolts-android one in My-Project\\libs\\bolts-android-1.2.0.jar the other usinge maven with compile 'com.parse.bolts:bolts-android:1.+'

Remove the lib that's on the lib folder.