Flutter: Sequence contains more than one matching element

When i am trying to build the appbundle, i get this error:

Execution failed for task ':app:buildReleasePreBundle'.
> Sequence contains more than one matching element.

But when i try to build the apk, it works good. When i run flutter run it works fine

I don't know what to do

In Flutter doctor all is fine, i already try deleting build, dart tool and executre flutter clean. In the build of ios also works good.

I hate gradle problems, btw

This is my code:

build.gradle (app)

plugins {
    id "com.android.application"
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"
    id "com.google.gms.google-services"
    id "com.google.firebase.crashlytics"
}

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.compubac.whiz"

    compileSdkVersion 35

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_1_8
    }

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

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        applicationId "com.compubac.whiz"
        minSdkVersion 30
        targetSdkVersion 35
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    splits {
        abi {
            reset()
            enable true
            universalApk true
            include "armeabi-v7a", "x86", "arm64-v8a"
        }
    }

    /* signingConfigs {
       release {
           keyAlias keystoreProperties['keyAlias']
           keyPassword keystoreProperties['keyPassword']
           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
           storePassword keystoreProperties['storePassword']
       }
    } */

    buildTypes {
        release {
            signingConfig signingConfigs.debug
            /* signingConfig signingConfigs.release */

            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile(
                    'proguard-android-optimize.txt'),
                    'proguard-rules.pro'
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation 'com.google.firebase:firebase-analytics:17.2.2'
    implementation 'com.facebook.android:facebook-android-sdk:[5,6)'
    implementation 'com.android.support:multidex:2.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}

build.gradle (project)

allprojects {
    repositories {
        google()
        mavenCentral()
    }

    subprojects {
        afterEvaluate { project ->
            if (project.hasProperty('android')) {
                project.android {
                    if (namespace == null) {
                        namespace project.group
                    }
                }
            }
        }
    }
}

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

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

gradle.properties

org.gradle.jvmargs=-Xmx4096m
android.enableR8=true
android.useAndroidX=true
android.enableJetifier=true

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 "8.10.0" apply false
    id "org.jetbrains.kotlin.android" version "2.0.20" apply false
    id "com.google.gms.google-services" version "4.4.0" apply false
    id "com.google.firebase.crashlytics" version "2.9.9" apply false
}

include ":app"

Apparently your Flutter is out of date, the content of android/app/build.gradle is still the old one... Flutter now uses Kotlinfor the Android configuration files in the project.

Run this command in your terminal(cmdor powershellfor windows) to update your Flutter:

$ flutter upgrade

this will probably solve the problem.

when you update Flutter and start another project, make sure the android/app/build.gradle configuration file is as kotlin file.