Execution failed for task ':audioplayers:compileDebugKotlin'

Question

I'm facing this nasty error when trying to compile my Flutter App into an Android simulator. Here is the error log (is too long to paste it entirely):

aunching lib/main.dart on sdk gphone x86 in debug mode... Running Gradle task 'assembleDebug'... Note: Some input files use or override a deprecated API. Note: Recompile with -Xlint:deprecation for details. e: Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors e: /Users/reinier/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/META-INF/kotlin-stdlib.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15. e: /Users/reinier/.gradle/caches/transforms-2/files-2.1/4d4ccf1034ba5937e6e7ba3aa34d2661/jetified-core-ktx-1.6.0-beta02-api.jar!/META-INF/core-ktx_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15. e: /Users/reinier/.gradle/caches/transforms-2/files-2.1/77bab1911042ab2c6d5cc0b2e2ee053c/jetified-kotlin-stdlib-common-1.5.10.jar!/META-INF/kotlin-stdlib-common.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15. e: /Users/reinier/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/audioplayers-0.18.3/android/src/main/kotlin/xyz/luan/audioplayers/AudioplayersPlugin.kt: (18, 32): Unresolved reference: mutableMapOf e: /Users/reinier/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/audioplayers-0.18.3/android/src/main/kotlin/xyz/luan/audioplayers/AudioplayersPlugin.kt: (25, 9): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.

. . . . .

e: /Users/reinier/Developer/flutter/.pub-cache/hosted/pub.dartlang.org/audioplayers-0.18.3/android/src/main/kotlin/xyz/luan/audioplayers/WrappedSoundPool.kt: (235, 30): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15. The class is loaded from /Users/reinier/.gradle/caches/transforms-2/files-2.1/24fa3aa8d2270e5eb067bbe36e9b7563/jetified-kotlin-stdlib-1.5.10.jar!/kotlin/Unit.class

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':audioplayers:compileDebugKotlin'.

Compilation error. See log for more details

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 21s Exception: Gradle task assembleDebug failed with exit code 1

1. I already tried changing "minSdkVersion 16" to "minSdkVersion 23" at android/app/build.gradle:38 and is not working.
2. Tried using the version 0.17.0 of audioplayers and the same, not working.
3. Tried using the version ^0.10.0 of audioplayers and nothing.
4. Tried doing the previos steps and then executing on the terminal: flutter clean & flutter pub get... and nothing.
5. I already updated the Flutter SDK and nothing. Still not working for Android.

It compiles perfectly on an IOS simulator. This error has emerged several times after each audioplayers package update. I'm using compileSdkVersion 30 on Android Studio 4.2.1

This is my pubspec.yaml file:

name: feeddy_flutter
description: A multi screen foods listing Flutter app

publish_to: 'none' # Remove this line if you wish to publish to pub.dev

version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.2
  intl: ^0.17.0
  uuid: ^3.0.4
  currency_text_input_formatter: ^2.0.1
  date_time_picker: ^2.0.0
  rflutter_alert: ^2.0.2
  faker: ^1.3.0
  fl_chart: ^0.35.0
  provider: ^5.0.0
  tinycolor: ^1.0.3
  font_awesome_flutter: ^9.0.0
  audioplayers: ^0.18.3
  empty_widget: ^0.0.2
  splashscreen: ^1.3.5
  native_device_orientation: ^1.0.0
  sqflite: ^2.0.0+3
  flutter_switch: ^0.3.1
  flutter_colorpicker: ^0.4.0
  enum_to_string: ^2.0.1
  humanizer: ^0.0.2
  route_observer_mixin: ^1.5.0+1

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
  uses-material-design: true

  assets:
    - assets/images/
    - assets/audio/

  fonts:
    - family: Luminari
      fonts:
        - asset: assets/fonts/Luminari/Luminari-Regular.ttf
          style: normal
          weight: 500
        - asset: assets/fonts/Luminari/Luminari-Regular.woff
          style: normal
          weight: 500
    - family: SourceSansPro
      fonts:
        - asset: assets/fonts/Source_Sans_Pro/SourceSansPro-Regular.ttf
          style: normal
          weight: 500
    - family: OpenSans
      fonts:
        - asset: assets/fonts/OpenSans/OpenSans-Regular.ttf
          style: normal
          weight: 500
        - asset: assets/fonts/OpenSans/OpenSans-Bold.ttf
          weight: 700
    - family: Quicksand
      fonts:
        - asset: assets/fonts/Quicksand/Quicksand-Regular.ttf
          style: normal
          weight: 500
        - asset: assets/fonts/Quicksand/Quicksand-Medium.ttf
        - asset: assets/fonts/Quicksand/Quicksand-Light.ttf
        - asset: assets/fonts/Quicksand/Quicksand-Bold.ttf
          weight: 700
    - family: Raleway
      fonts:
        - asset: assets/fonts/Raleway/Raleway-Regular.ttf
          style: normal
          weight: 500
        - asset: assets/fonts/Raleway/Raleway-Bold.ttf
          weight: 700
        - asset: assets/fonts/Raleway/Raleway-Black.ttf
          weight: 900
    - family: RobotoCondensed
      fonts:
        - asset: assets/fonts/RobotoCondensed/RobotoCondensed-Regular.ttf
          style: normal
          weight: 500
        - asset: assets/fonts/RobotoCondensed/RobotoCondensed-Bold.ttf
          weight: 700
        - asset: assets/fonts/RobotoCondensed/RobotoCondensed-Light.ttf
          weight: 300
        - asset: assets/fonts/RobotoCondensed/RobotoCondensed-Italic.ttf
          style: italic
    - family: AppIcons
      fonts:
        - asset: assets/fonts/AppIcons/AppIcons.ttf

Answer 1

Updating to a newer kotlin version in build.gradle seems to solve the issue for me.

ext.kotlin_version = '1.4.32'

Solution from a related question

Answer 2

this happened to me after i added the workmanager plugin. to fix this, go to the android folder and in build.gradle use kotlin version 1.5.31

ext.kotlin_version = '1.5.31'

Answer 3

Please open android > build.gradle

Inside buildscript { }, you'll find ext.kotlin_version (Line 2 in file)

Replace whatever version it is with Latest Stable Kotlin Version

As of July 28, 2021 it is, ext.kotlin_version = '1.5.21'

Now, re-install the app. If it's already running, press Stop then press Run (Play) again.

Answer 4

Go to android>build.gradle and update your Kotlin version.

ext.kotlin_version = '1.4.32'  

This worked for me.

Answer 5

As for Flutter 2.10 there was a breaking change with required Kotlin version - Ref.

Here is a migration guide

This means that if you previosly created a project a long time ago (with java) then it means you need to add Kotlin plugin to build.gradle. I suggest launching flutter create --org com.sample sample which generates up-to-date configuration. Then you can check what is missing.