R8 error while building

[AhsanSarwar45]

After installing this package, running my project gives the following error:

ERROR:D8: com.android.tools.r8.kotlin.H

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeExtDexDevDebug'.
> Could not resolve all files for configuration ':app:devDebugRuntimeClasspath'.
   > Failed to transform kotlin-stdlib-1.9.0.jar (org.jetbrains.kotlin:kotlin-stdlib:1.9.0) 
to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-d
esugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexin
g-min-sdk=21, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status
=release, org.gradle.usage=java-runtime}.
      > Execution failed for DexingWithClasspathTransform: /home/ahsan/.gradle/caches/transf
orms-3/3b2f4188171f5e3ee96dda626b21c510/transformed/jetified-kotlin-stdlib-1.9.0.jar.
         > Error while dexing.

* 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 12s
Running Gradle task 'assembleDevDebug'...                          13.3s

┌─ Flutter Fix ──────────────────────────────────────────────────────────────┐
│ [!] The shrinker may have failed to optimize the Java bytecode.            │
│ To disable the shrinker, pass the `--no-shrink` flag to this command.      │
│ To learn more, see: https://developer.android.com/studio/build/shrink-code │
└────────────────────────────────────────────────────────────────────────────┘
Error: Gradle task assembleDevDebug failed with exit code 1

android/build.gradle:

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

ext.kotlin_version = "1.8.0"

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}

android/settings.gradle:

pluginManagement {
    def flutterSdkPath = {
        def properties = new Properties()
        file("local.properties").withInputStream { properties.load(it) }
        def flutterSdkPath = properties.getProperty("flutter.sdk")
        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
        return flutterSdkPath
    }()

    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")

    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

plugins {
    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
    id "com.android.application" version "7.4.2" apply false
    id "org.jetbrains.kotlin.android" version "1.8.0" apply false
}

include ":app"

android/src/build.gradle:

import com.android.build.OutputFile

plugins {
    id "com.android.application"
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"
}


def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    // namespace "com.vicolo.chrono"

    compileSdkVersion 34
    ndkVersion flutter.ndkVersion
    

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.vicolo.chrono"
        minSdkVersion 21
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()  
        versionName flutterVersionName
        multiDexEnabled true
    }
    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile = file('release-key.jks')
            storePassword keystoreProperties['storePassword']        
        }
    }

    buildTypes {
        release {
            signingConfig signingConfigs.release

            minifyEnabled true
            shrinkResources true
        }
    }

    applicationVariants.all { variant ->
    variant.outputs.each { output ->
        // For each separate APK per architecture, set a unique version code as described here:
        // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits
        def versionCodes = ["armeabi-v7a":1, "arm64-v8a":2, x86_64:3]
        def abi = output.getFilter(OutputFile.ABI)
        if (abi != null) {  // null for the universal-debug, universal-release variants
            output.versionCodeOverride =
                    variant.versionCode * 10 + versionCodes.get(abi)}
      }
    }

    flavorDimensions "app"

    productFlavors {
      prod {
        dimension "app"
        resValue "string", "app_name", "Chrono"
      }

      dev {
        dimension "app"
        resValue "string", "app_name", "Chrono Dev"
        // versionNameSuffix "-dev",
        applicationIdSuffix ".dev"
      }
    }

    dependenciesInfo {
        // Disables dependency metadata when building APKs.
        // This is for the signed .apk that we post to GitHub, so the dependency metadata isn't relevant.
        includeInApk false
        // Enable dependency metadata when building Android App Bundles.
        // This is for the Google Play Store, so we'll want the metadata.
        includeInBundle true
    }
}

flutter {
    source '../..'
}

Tried with kotlin 1.9.0 too, no luck.

[ABausG]

Does this error still persist?

[hamishjohnson]

When I update my old project from Gradle 7.3.0 I'm receiving this issue.

However, it also gives errors on new projects, even though new projects are on Gradle 7.3.0

[v0ker]

You can try updating the minSdk version. After I set minSdk = 24, the error no longer occurred.