title: java.lang.NoClassDefFoundError: org.jsoup.Jsoup
body: <p>i got this error:</p>
  
  <pre><code>    java.lang.RuntimeException: An error occured while executing doInBackground()
      at android.os.AsyncTask$3.done(AsyncTask.java:299)
      at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
      at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
      at java.util.concurrent.FutureTask.run(FutureTask.java:239)
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
      at java.lang.Thread.run(Thread.java:849)
  Caused by: java.lang.NoClassDefFoundError: org.jsoup.Jsoup
  </code></pre>
  
  <p>the problem is that not all Android version get this error. For example Android 6 works well whereas Android 4.3 throws this error. Could somebody help me what to do?</p>
  
  <p>my build.gradle:</p>
  
  <pre><code>    apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.3"
      defaultConfig {
          applicationId 'com.test'
          minSdkVersion 15
          targetSdkVersion 23
          versionCode 1
          versionName "1"
          multiDexEnabled true
  
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
      productFlavors {
      }
  }
  
  dependencies {
      compile fileTree(include: ['*.jar'], dir: 'libs')
      testCompile 'junit:junit:4.12'
      compile 'com.android.support:appcompat-v7:23.2.1'
      compile 'com.android.support:design:23.2.1'
      compile 'com.android.support:support-v4:23.2.1'
      compile 'se.simbio.encryption:library:1.2.0'
      compile 'com.google.android.gms:play-services:8.4.0'
      compile files('libs/jsoup-1.9.2.jar')
      compile 'com.google.android.gms:play-services-appindexing:8.4.0'
  }
  </code></pre>