title: Error:Execution failed for task ':app:packageRelease'. > java.io.IOException: Failed to read zip file
body: <p>I get the following error when i try to build release build. I am using android studio 2.3 . I have added my gradle and proguard rules files below and i ma using mac with mac os X</p>
  
  <pre><code>Error:Execution failed for task ':app:packageRelease'.
  &gt; java.io.IOException: Failed to read zip file '/Users/username/Documents/Android Projects/Project Name/app/build/intermediates/transforms/proguard/release/jars/3/1f/main.jar'.
  </code></pre>
  
  <p>proguard rules file</p>
  
  <pre><code>-keepclassmembers class * {
      @android.webkit.JavascriptInterface &lt;methods&gt;;
  }
  
  -keepattributes JavascriptInterface
  -keepattributes *Annotation*
  
  -dontwarn com.razorpay.**
  -keep class com.razorpay.** {*;}
  
  -optimizations !method/inlining/*
  
  -keepclasseswithmembers class * {
    public void onPayment*(...);
  }
  
  -keep @interface butterknife.*
  
  -keepclasseswithmembers class * {
      @butterknife.* &lt;fields&gt;;
  }
  
  -keepclasseswithmembers class * {
      @butterknife.* &lt;methods&gt;;
  }
  
  -keepclasseswithmembers class * {
      @butterknife.On* &lt;methods&gt;;
  }
  
  -keep class **$$ViewInjector {
      public static void inject(...);
      public static void reset(...);
  }
  
  -keep class **$$ViewBinder {
      public static void bind(...);
      public static void unbind(...);
  }
  
  
  
  -keep class com.google.common.** {*;}
  
  
  -dontwarn sun.misc.Unsafe
  -dontwarn javax.annotation.**
  </code></pre>
  
  <p>gradle file </p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 25
      buildToolsVersion "25.0.2"
      defaultConfig {
          applicationId "com.company.projectname"
          minSdkVersion 15
          targetSdkVersion 25
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled true
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  repositories {
      mavenCentral()
  }
  
  
  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.razorpay:checkout:1.2.1'
      compile 'com.android.support:appcompat-v7:25.1.0'
      compile 'com.jakewharton:butterknife:8.5.1'
      compile 'jp.wasabeef:picasso-transformations:2.1.0'
      compile 'com.makeramen:roundedimageview:2.3.0'
      compile 'com.github.greenfrvr:hashtag-view:1.2.1'
      compile 'com.leaking.slideswitch:slideswitch:1.0.0'
      compile 'com.squareup.picasso:picasso:2.5.2'
      compile 'uk.co.chrisjenx:calligraphy:2.2.0'
      compile 'com.android.volley:volley:1.0.0'
      compile 'com.android.support:recyclerview-v7:25.1.0'
      compile 'com.github.devlight:infinitecycleviewpager:1.0.2'
      annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
  
      testCompile 'junit:junit:4.12'
  }
  </code></pre>
  
  <p>project level gradle</p>
  
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:2.3.0'
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          maven {
              url 'https://dl.bintray.com/leaking/maven'
          }
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>