title: Android studio:java.util.zip.ZipException: duplicate entry error while running the app
body: <p>I am getting this error in my Android Project when i run the app.</p>
  
  <p><code>Error:Execution failed for task :app:transformClassesWithJarMergingForDebug.
   com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/google/android/gms/internal/zzaj.class</code></p>
  
  <p><strong>Here is my <code>build.gradle</code></strong></p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.3"
  
      defaultConfig {
          applicationId "com.akapoor.kiittimetabletest1"
          manifestPlaceholders = [manifestApplicationId: "${applicationId}",
                                  onesignal_app_id: "6cebaxxx-xxxx-xxxx-89af-55fbddb523ea",
                                  onesignal_google_project_number: "4283878xxx"]
          minSdkVersion 15
          targetSdkVersion 23
          versionCode 5
          versionName "2.0"
          multiDexEnabled true
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      testCompile 'junit:junit:4.12'
  
      compile 'com.android.support:support-v4:23.0.1'
  
      compile 'com.android.support:appcompat-v7:23.4.0'
      compile 'com.android.support:design:23.4.0'
      compile 'de.hdodenhof:circleimageview:1.3.0'
      compile 'com.android.support:support-v4:23.4.0'
      compile 'com.google.android.gms:play-services-ads:9.4.0'
      compile 'com.pushbots:pushbots-lib:2.0.13@aar'
      compile 'com.mcxiaoke.volley:library:1.0.19'
      compile 'com.android.support:cardview-v7:23.4.0'
  
      compile 'com.onesignal:OneSignal:2.+@aar'
      compile 'com.google.android.gms:play-services-gcm:+'
      compile 'com.google.android.gms:play-services-analytics:+'
      compile "com.google.android.gms:play-services-location:+"
  }
  </code></pre>
  
  <p>I have tried solutions posted on other stackoverflow answers but none was working for me. Please check the code. 
  Thank You :) </p>