I had a similar error where the Kotlin version was not compatible the gradle versions, this is how I fixed it:
This is my project/build.gradle file:
buildscript {
ext.kotlin_version = '2.0.20' //Your preferred Kotlin Version
repositories {
google()
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
google()
mavenCentral()
}
}
rootProject.buildDir = "../build"
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(":app")
}
tasks.register("clean", Delete) {
delete rootProject.buildDir
}
This is my settings.gradle file:
pluginManagement {
def flutterSdkPath = {
def properties = new Properties()
file("local.properties").withInputStream { properties.load(it) }
def flutterSdkPath = properties.getProperty("flutter.sdk")
assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
return flutterSdkPath
}()
includeBuild("$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 "8.5.0" apply false
id "org.jetbrains.kotlin.android" version "1.9.20" apply false
id "com.google.gms.google-services" version "4.3.10" apply false
}
include ":app"
My app/build.gradle file:
plugins {
id "com.android.application"
id "kotlin-android"
id "dev.flutter.flutter-gradle-plugin"
}
android {
namespace = "com.example.flutte_app"
compileSdk = flutter.compileSdkVersion
ndkVersion = "26.1.10909125"
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = JavaVersion.VERSION_1_8
}
defaultConfig {
applicationId = "com.example.flutte_app"
minSdk = flutter.minSdkVersion
targetSdk = flutter.targetSdkVersion
versionCode = flutter.versionCode
versionName = flutter.versionName
}
buildTypes {
release {
signingConfig = signingConfigs.debug
}
}
}
flutter {
source = "../.."
}
And then in the AndroidManifest.xml (location: <project>/android/app/src/main) file I removed the " package="com.example.yourapp" " at the very top.
According to the [docs](https://docs.flutter.dev/release/breaking-changes/flutter-gradle-plugin-apply) the away we deal with gradle plugins has changed. Follow these steps to your project. Basically the `build.gradle` on android level is now like:
allprojects {
repositories {
google()
mavenCentral()
}
}
rootProject.buildDir = '../build'
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(':app')
}
tasks.register("clean", Delete) {
delete rootProject.buildDir
}
no `buildScript{...}` anymore.
And the `settings.gradle` is now like:
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 "{agpVersion}" apply false
id "org.jetbrains.kotlin.android" version "{kotlinVersion}" apply false
}
include ":app"
You need then especify the [latest kotlin version](https://kotlinlang.org/docs/releases.html#release-details) on plugins as the message says. Here's an exemple of mine:
plugins {
id "dev.flutter.flutter-plugin-loader" version "1.0.0"
id "com.android.application" version "7.3.0" apply false
id "org.jetbrains.kotlin.android" version "1.9.21" 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
}
I had to delete my `.gradle` folder on `users` to the changes apply properly, not just the caches folder inside. Folder's path
1. on Mac: `/Users/{your_user}/.gradle`
2. on Windows: `%USERPROFILE%/.gradle`
I'm on Mac so I just ran `rm -rf .gradle`.
Next go to your project, run `flutter clean` and finally procede to run the app. This run took a little bit longer here but it works.
Hope it helps.
