Android execution failed for task application: proguardRelease

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I am unable to generate a signed APK for my app, I am stuck with the error java.io.IOException Execution failed for task:'app:proguardRelease' I have what I think is a basic gradle file see below

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.1"

    defaultConfig {
        applicationId "com.okason.clients"
        minSdkVersion 16
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.google.api-client:google-api-client:1.19.0'
    compile 'com.google.android.gms:play-services:6.1.71'
    compile 'com.android.support:support-v4:21.0.0'
    compile 'com.android.support:appcompat-v7:21.0.0'
}

The generated Proguard-rules.pro file is empty amd I have not touched the proguard-android.txt file in the SDK. I even tried to copy this file to the root of app to be the same location as the app.gradle file without success.

I tried to run this command gradlew.bat assembleRelease per this [SO Question][1] with success. Please can someone take a look and let me know what I am doing wrong. I have update the SDK and Android Studio to the latest versions.


Solved the problem by setting minifyEnabled true to minifyEnabled false in the app.gradle file