title: Flutter ClassNotFoundException (java.lang.RuntimeException) crash error
body: <p>Recently, I uploaded my Flutter app to Play Store.
  My app crashed after installing and opening the app.
  I've got several Crash Reports.
  I did researched everywhere about this error and found nothing,
  I even contacted Google Play's Support.</p>
  
  <p>I am using Firebase Auth, cloud_firestore, google_sign_in... (check pubspec.yamll)</p>
  
  <p>Help will be appreciated</p>
  
  <p>Flutter Doctor:</p>
  
  <pre><code>Active code page: 1252
  Doctor summary (to see all details, run flutter doctor -v):
  [âˆš] Flutter (Channel stable, v1.17.3, on Active code page: 1252
  
  Microsoft Windows [Version 10.0.18363.836], locale he-IL)
  
  [âˆš] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
  [âˆš] Android Studio (version 3.6)
  [!] IntelliJ IDEA Community Edition (version 2019.3)
      X Flutter plugin not installed; this adds Flutter specific functionality.
      X Dart plugin not installed; this adds Dart specific functionality.
  [âˆš] VS Code (version 1.45.1)
  [âˆš] Connected device (1 available)
  
  ! Doctor found issues in 1 category.
  </code></pre>
  
  <p>pubspec.yaml:</p>
  
  <pre><code>name: iusefully
  description: Be more productive
  
  # The following defines the version and build number for your application.
  # A version number is three numbers separated by dots, like 1.2.43
  # followed by an optional build number separated by a +.
  # Both the version and the builder number may be overridden in flutter
  # build by specifying --build-name and --build-number, respectively.
  # In Android, build-name is used as versionName while build-number used as versionCode.
  # Read more about Android versioning at https://developer.android.com/studio/publish/versioning
  # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
  # Read more about iOS versioning at
  # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
  version: 2.0+1
  
  module:
    androidX: true
  
  environment:
    sdk: "&gt;=2.5.2 &lt;3.0.0"
  
  dependencies:
    flutter:
      sdk: flutter
  
    google_sign_in: 4.5.1 
    firebase_auth: 0.16.1
    firebase_core: ^0.4.5
    firebase_analytics: ^5.0.14
    # cloud_firestore: ^0.13.0+1
    cloud_firestore: 0.13.6
  
    rxdart: 0.20.0
    cupertino_icons: ^0.1.2
    provider: ^4.0.4
    flutter_phoenix: "^0.1.0"
    animations: ^1.0.0+5
    curved_navigation_bar: ^0.3.2
    flutter_spinkit: "^4.1.2"
  
  
  
    # The following adds the Cupertino Icons font to your application.
    # Use with the CupertinoIcons class for iOS style icons.
  
  dev_dependencies:
    flutter_test:
      sdk: flutter
  
  
  # For information on the generic Dart part of this file, see the
  # following page: https://dart.dev/tools/pub/pubspec
  
  # The following section is specific to Flutter.
  flutter:
  
    # The following line ensures that the Material Icons font is
    # included with your application, so that you can use the icons in
    # the material Icons class.
    uses-material-design: true
  
    # To add assets to your application, add an assets section, like this:
    # assets:
    #  - images/a_dot_burr.jpeg
    #  - images/a_dot_ham.jpeg
    assets:
      - images/google.png
      - images/login.png
      - images/human1.png
      - images/onboarding0.png
      - images/onboarding1.png
      - images/onboarding2.png
  
    # An image asset can refer to one or more resolution-specific "variants", see
    # https://flutter.dev/assets-and-images/#resolution-aware.
  
    # For details regarding adding assets from package dependencies, see
    # https://flutter.dev/assets-and-images/#from-packages
  
    # To add custom fonts to your application, add a fonts section here,
    # in this "flutter" section. Each entry in this list should have a
    # "family" key with the font family name, and a "fonts" key with a
    # list giving the asset and other descriptors for the font. For
    # example:
    # fonts:
    #   - family: Schyler
    #     fonts:
    #       - asset: fonts/Schyler-Regular.ttf
    #       - asset: fonts/Schyler-Italic.ttf
    #         style: italic
    #   - family: Trajan Pro
    #     fonts:
    #       - asset: fonts/TrajanPro.ttf
    #       - asset: fonts/TrajanPro_Bold.ttf
    #         weight: 700
    #
    fonts:
      - family: RobotoMono
        fonts:
          - asset: fonts/RobotoMono-Bold.ttf
      - family: NotoSans
        fonts:
          - asset: fonts/NotoSans-Regular.ttf
  
    # For details regarding fonts from package dependencies,
    # see https://flutter.dev/custom-fonts/#from-packages
  </code></pre>
  
  <p>app/build.gradle</p>
  
  <pre><code>def localProperties = new Properties()
  def localPropertiesFile = rootProject.file('local.properties')
  if (localPropertiesFile.exists()) {
      localPropertiesFile.withReader('UTF-8') { reader -&gt;
          localProperties.load(reader)
      }
  }
  
  def flutterRoot = localProperties.getProperty('flutter.sdk')
  if (flutterRoot == null) {
      throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
  }
  
  def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
  if (flutterVersionCode == null) {
      flutterVersionCode = '2.0+1'
  }
  
  def flutterVersionName = localProperties.getProperty('flutter.versionName')
  if (flutterVersionName == null) {
      flutterVersionName = '2.0'
  }
  
  apply plugin: 'com.android.application'
  apply plugin: 'kotlin-android'
  apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
  
  // def keystorePropertiesFile = rootProject.file("key.properties")
  // def keystoreProperties = new Properties()
  def keystoreProperties = new Properties()
  def keystorePropertiesFile = rootProject.file('key.properties')
  if (keystorePropertiesFile.exists()) {
      keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
  }
  
  android {
      compileSdkVersion 28
  
      sourceSets {
          main.java.srcDirs += 'src/main/kotlin'
      }
  
      lintOptions {
          disable 'InvalidPackage'
      }
  
      defaultConfig {
          // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
          applicationId "CLASSIFIED"
          minSdkVersion 23
          targetSdkVersion 28
          versionCode flutterVersionCode.toInteger()
          versionName flutterVersionName
          testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
          multiDexEnabled true
          ndk {
              abiFilters 'x86', 'armeabi-v7a'
          }
      }
  
      signingConfigs {
         release {
             keyAlias keystoreProperties['keyAlias']
             keyPassword keystoreProperties['keyPassword']
             storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
             storePassword keystoreProperties['storePassword']
         }
      }
  
      buildTypes {
          release {
              // TODO: Add your own signing config for the release build.
              // Signing with the debug keys for now, so `flutter run --release` works.
              signingConfig signingConfigs.release
              minifyEnabled true
          }
      }
  }
  
  flutter {
      source '../..'
  }
  
  dependencies {
      implementation 'com.android.support:multidex:1.0.3'
      implementation 'android.arch.lifecycle:common-java8:1.1.0'
  
      implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.2'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
  }
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>build.gradle (root)</p>
  
  <pre><code>buildscript {
      ext.kotlin_version = '1.3.50'
      repositories {
          google()
          jcenter()
      }
  
      dependencies {
          //classpath 'com.android.tools.build:gradle:3.2.1' // 3.5.0
          classpath 'com.android.tools.build:gradle:3.4.2'
          classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
          classpath 'com.google.gms:google-services:4.0.1'
      }
  }
  
  allprojects {
      repositories {
          google()
          jcenter()
      }
  }
  
  rootProject.buildDir = '../build'
  subprojects {
      project.buildDir = "${rootProject.buildDir}/${project.name}"
  }
  subprojects {
      project.evaluationDependsOn(':app')
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <ul>
  <li>I have keystore (.jks) as well. But I think the problem isn't there.</li>
  <li>I am using app bundles</li>
  </ul>
  
  <p>Thanks in advance :)</p>
  
  <p>Crash Log (using master channel):</p>
  
  <pre><code>Launching lib\main.dart on Android SDK built for x86 in debug mode...                                                                                                                                                                                                D
  Active code page: 1252
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
  Active code page: 1252
  Active code page: 1252
  Note: D:\flutter\.pub-cache\hosted\pub.dartlang.org\cloud_firestore-0.13.6\android\src\main\java\io\flutter\plugins\firebase\cloudfirestore\CloudFirestorePlugin.java uses unchecked or unsafe operations.
  Note: Recompile with -Xlint:unchecked for details.
  Running Gradle task 'assembleDebug'...                                  
  Running Gradle task 'assembleDebug'... Done                        41.9s
  âˆš Built build\app\outputs\flutter-apk\app-debug.apk.
  Installing build\app\outputs\flutter-apk\app.apk...                 2.6s
  E/FlutterLoader( 6685): Flutter initialization failed.
  E/FlutterLoader( 6685): java.util.concurrent.ExecutionException: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/lib/x86, /system/lib, /vendor/lib]]] couldn't find "libflutter.so"
  E/FlutterLoader( 6685):         at java.util.concurrent.FutureTask.report(FutureTask.java:123)
  E/FlutterLoader( 6685):         at java.util.concurrent.FutureTask.get(FutureTask.java:193)
  E/FlutterLoader( 6685):         at io.flutter.embedding.engine.loader.FlutterLoader.ensureInitializationComplete(FlutterLoader.java:193)
  E/FlutterLoader( 6685):         at io.flutter.embedding.engine.FlutterEngine.&lt;init&gt;(FlutterEngine.java:207)
  E/FlutterLoader( 6685):         at io.flutter.embedding.engine.FlutterEngine.&lt;init&gt;(FlutterEngine.java:188)
  E/FlutterLoader( 6685):         at io.flutter.embedding.engine.FlutterEngine.&lt;init&gt;(FlutterEngine.java:154)
  E/FlutterLoader( 6685):         at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.setupFlutterEngine(FlutterActivityAndFragmentDelegate.java:229)
  E/FlutterLoader( 6685):         at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:151)
  E/FlutterLoader( 6685):         at io.flutter.embedding.android.FlutterActivity.onCreate(FlutterActivity.java:409)
  E/FlutterLoader( 6685):         at android.app.Activity.performCreate(Activity.java:7009)
  E/FlutterLoader( 6685):         at android.app.Activity.performCreate(Activity.java:7000)
  E/FlutterLoader( 6685):         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
  E/FlutterLoader( 6685):         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
  E/FlutterLoader( 6685):         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
  E/FlutterLoader( 6685):         at android.app.ActivityThread.-wrap11(Unknown Source:0)
  E/FlutterLoader( 6685):         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
  E/FlutterLoader( 6685):         at android.os.Handler.dispatchMessage(Handler.java:106)
  E/FlutterLoader( 6685):         at android.os.Looper.loop(Looper.java:164)
  E/FlutterLoader( 6685):         at android.app.ActivityThread.main(ActivityThread.java:6494)
  E/FlutterLoader( 6685):         at java.lang.reflect.Method.invoke(Native Method)
  E/FlutterLoader( 6685):         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
  E/FlutterLoader( 6685):         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
  E/FlutterLoader( 6685): Caused by: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.tomeruby.iusefully-0JfExLxHhUqLUimkj6h-1Q==/lib/x86, /system/lib, /vendor/lib]]] couldn't find "libflutter.so"
  E/FlutterLoader( 6685):         at java.lang.Runtime.loadLibrary0(Runtime.java:1011)
  E/FlutterLoader( 6685):         at java.lang.System.loadLibrary(System.java:1657)
  E/FlutterLoader( 6685):         at io.flutter.embedding.engine.loader.FlutterLoader$1.call(FlutterLoader.java:145)
  E/FlutterLoader( 6685):         at io.flutter.embedding.engine.loader.FlutterLoader$1.call(FlutterLoader.java:140)
  E/FlutterLoader( 6685):         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  E/FlutterLoader( 6685):         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
  E/FlutterLoader( 6685):         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
  E/FlutterLoader( 6685):         at java.lang.Thread.run(Thread.java:764)
  </code></pre>