title: Libgdx game crashes on Android
body: <p>I made a game using libgdx and it runs fine on both desktop and android before. I'm not sure if its because I started using box2d physics engine and liquidfun particles,what basically happens is that when I click play on my game it start loading then after loading it should go to the gameScreen, but it crashes then says "Unfortunately, myGame has stopped".</p>
  
  <p>error message:</p>
  
  <pre><code>E/AndroidRuntime: FATAL EXCEPTION: GLThread 3764
  Process: com.nivekbryan.puffypuff, PID: 8416
  java.lang.NoClassDefFoundError: Failed resolution of: Lcom/badlogic/gdx/physics/box2d/World;
  </code></pre>
  
  <p>I followed this <a href="https://github.com/finnstr/gdx-liquidfun-extension/wiki/Setup" rel="noreferrer">setup tutorial</a> on how to port liquidfun library, its from 2014 kinda old.
  The game runs Ok as desktop application.</p>
  
  <p>This is my build.gradle file (dependencies), what could be the problem? and why is working as desktop application and not as an android application?</p>
  
  <pre><code>buildscript {
      repositories {
          mavenLocal()
          mavenCentral()
          maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
          jcenter()
      }
      dependencies {
          classpath 'de.richsource.gradle.plugins:gwt-gradle-plugin:0.6'
          classpath 'com.android.tools.build:gradle:2.0.0'
          classpath 'com.mobidevelop.robovm:robovm-gradle-plugin:2.1.0'
      }
  }
  
  allprojects {
      apply plugin: "eclipse"
      apply plugin: "idea"
  
      version = '1.0'
      ext {
          appName = "Puffy Puff"
          gdxVersion = '1.9.3'
          roboVMVersion = '2.1.0'
          box2DLightsVersion = '1.4'
          ashleyVersion = '1.7.0'
          aiVersion = '1.8.0'
          admobVersion = '8.3.0'
      }
  
      repositories {
          mavenLocal()
          mavenCentral()
          maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
          maven { url "https://oss.sonatype.org/content/repositories/releases/" }
      }
  }
  
  project(":desktop") {
      apply plugin: "java"
  
  
      dependencies {
          compile project(":core")
          compile "com.badlogicgames.gdx:gdx-backend-lwjgl:$gdxVersion"
          compile "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop"
  
          compile "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-desktop"
          compile fileTree(dir: 'libs', include: '*.jar')
      }
  }
  
  project(":android") {
      apply plugin: "android"
  
      configurations { natives }
  
      dependencies {
          compile project(":core")
          compile "com.badlogicgames.gdx:gdx-backend-android:$gdxVersion"
          natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi"
          natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi-v7a"
          natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-arm64-v8a"
          natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86"
          natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86_64"
  
          compile "com.badlogicgames.gdx:gdx-freetype:$gdxVersion"
          natives "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-armeabi"
          natives "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-armeabi-v7a"
          natives "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-arm64-v8a"
          natives "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-x86"
          natives "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-x86_64"
          compile "com.google.android.gms:play-services-ads:8.3.0"
          compile fileTree(dir: 'libs', include: '*.so')
      }
  }
  
  project(":ios") {
      apply plugin: "java"
      apply plugin: "robovm"
  
  
      dependencies {
          compile project(":core")
          compile "com.mobidevelop.robovm:robovm-rt:$roboVMVersion"
          compile "com.mobidevelop.robovm:robovm-cocoatouch:$roboVMVersion"
          compile "com.badlogicgames.gdx:gdx-backend-robovm:$gdxVersion"
          compile "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-ios"
  
          compile "com.badlogicgames.gdx:gdx-freetype-platform:$gdxVersion:natives-ios"
      }
  }
  
  project(":html") {
      apply plugin: "gwt"
      apply plugin: "war"
  
  
      dependencies {
          compile project(":core")
          compile "com.badlogicgames.gdx:gdx-backend-gwt:$gdxVersion"
          compile "com.badlogicgames.gdx:gdx:$gdxVersion:sources"
          compile "com.badlogicgames.gdx:gdx-backend-gwt:$gdxVersion:sources"
      }
  }
  
  project(":core") {
      apply plugin: "java"
  
  
      dependencies {
          compile "com.badlogicgames.gdx:gdx:$gdxVersion"
  
          compile "com.badlogicgames.gdx:gdx-freetype:$gdxVersion"
          compile fileTree(dir: 'libs', include: '*.jar')
      }
  }
  
  tasks.eclipse.doLast {
      delete ".project"
  }
  </code></pre>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>I found this solution <a href="https://stackoverflow.com/questions/33032625/libgdx-liquidfun-integration-runtime-error">link</a> so what I did is I copied gdx-liquidfun.jar to Android -> libs then right click and add as library, but I still get the error. Help please, thanks in advance (I'm using Intellij Community Edition)</p>