任务执行失败：app：transformClassesAndResourcesWithProguardForRelease

Question

我正在尝试使用Gradle发布我的Android应用程序。

app build Grade ::

apply plugin: 'com.android.application'

android {

    compileSdkVersion 24

    buildToolsVersion "24.0.0"
    defaultConfig {
        applicationId "xxxx.xxxxx"
        minSdkVersion 9
        targetSdkVersion 24
        versionCode 1
        versionName "2.2"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled true

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        }    
    }
}



dependencies {

    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'

    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    testCompile 'junit:junit:4.12'

}