Build Release Proguard failed task : I try generate signed APK but not work......................................................................................................................

My proguard-rules.pro

    -optimizationpasses 5
    -dontusemixedcaseclassnames
    -dontskipnonpubliclibraryclasses
    -dontpreverify
    -verbose
    -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
    
    -keep public class * extends android.app.Activity
    -keep public class * extends android.app.Application
    -keep public class * extends android.app.Service
    -keep public class * extends android.content.BroadcastReceiver
    -keep public class * extends android.content.ContentProvider
    -keep public class * extends android.app.backup.BackupAgentHelper
    -keep public class * extends android.preference.Preference
    -keep public class com.android.vending.licensing.ILicensingService
    
    -keepclasseswithmembernames class * {
    native <methods>;
    }
    
    -keepclasseswithmembernames class * {
        public <init>(android.content.Context, android.util.AttributeSet);
    }
    
    -keepclasseswithmembernames class * {
        public <init>(android.content.Context, android.util.AttributeSet, int);
    }
    
    -keepclassmembers enum * {
        public static **[] values();
        public static ** valueOf(java.lang.String);
    }
    
    -keep class * implements android.os.Parcelable {
      public static final android.os.Parcelable$Creator *;
    }
    
    # ================ Google Play Services ================
    -keep class * extends java.util.ListResourceBundle {
        protected Object[][] getContents();
    }
    
    -keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
        public static final *** NULL;
    }
    
    -keepnames @com.google.android.gms.common.annotation.KeepName class *
    -keepclassmembernames class * {
        @com.google.android.gms.common.annotation.KeepName *;
    }
    
    -keepnames class * implements android.os.Parcelable {
        public static final ** CREATOR;
    }
    # ======================================================
    
    # ============ Corrige erros de compilação =============
    -dontwarn android.support.**
    -keeppackagenames org.jsoup.nodes
    -dontwarn okio.**
    # ======================================================
    
    # ==== crashlytics ====
    -keepattributes *Annotation*
    -keepattributes SourceFile,LineNumberTable
    -keep public class * extends java.lang.Exception
    # =====================

My dependencies:

    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        testCompile 'junit:junit:4.12'
        compile 'com.android.support:appcompat-v7:23.4.0'
        compile 'com.google.android.gms:play-services-ads:9.2.0'
        compile 'com.google.android.gms:play-services-analytics:9.2.0'
        compile 'com.android.support:design:23.4.0'
        compile('com.crashlytics.sdk.android:crashlytics:2.5.5@aar') {
            transitive = true;
        }
        compile 'org.jsoup:jsoup:1.9.2'
        compile 'com.github.hotchemi:android-rate:1.0.1'
        compile 'com.github.curioustechizen.android-ago:library:1.3.2'
        compile 'com.jakewharton:butterknife:8.0.1'
        apt 'com.jakewharton:butterknife-compiler:8.0.1'
        compile 'com.amitshekhar.android:android-networking:0.0.1'
        compile 'com.squareup.picasso:picasso:2.5.2'
    }

Error build:

    Error:Execution failed for task ':mobile:transformClassesAndResourcesWithProguardForRelease'.
    > java.io.IOException: Please correct the above warnings first.
    :mobile:transformClassesAndResourcesWithProguardForRelease FAILED
    Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.