RN upgrade 0.69.9 -> 0.73.1 Task :gradle-plugin:compileKotlin FAILED

[Choyeongdeok]

Environment

Things I’ve done to figure out my issue

• I used upgrade-helper to do my upgrade.

Upgrading version

from 0.69.9 to 0.73.1

Description

error
(1) Class 'kotlin.~~~' was compiled with an incompatible version of kotlin. The binary version of its metadata is 1.9.0, expected version is 1.7.1 (this error occured even though the version of kotlin is 1.7.10)

(2) Execution failed for task ':gradle-plugin:compileKotlin'.

A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction > Compilation error

my settings

react: 18.2.0
react-native: 0.73.1

android/build.gradle

buildscript {
    ext {
        buildToolsVersion = "34.0.0"
        minSdkVersion = 21
        compileSdkVersion = 34
        targetSdkVersion = 34
        ndkVersion = "25.1.8937393"
        kotlinVersion = "1.7.10"
    }
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
        classpath('com.android.tools.build:gradle')
        classpath("com.facebook.react:react-native-gradle-plugin")
        classpath('com.google.gms:google-services:4.3.10')
        classpath('com.google.firebase:firebase-crashlytics-gradle:2.7.1')
    }
}

gradle-wrapper.properties

distributionBase=GRADLE_USER_HOME
distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-all.zip
networkTimeout=10000
validateDistributionUrl=true
distributionPath=wrapper/dists
zipStorePath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME

[prakashkrsingh0]

With the same issue, I'm also suffering. Please let me know if you know of any solution to this problem.

Task :react-native-gradle-plugin:compileKotlin FAILED
e: Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors

/node_modules/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactExtension.kt: (57, 42): Class 'kotlin.reflect.KClass' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
/Users/prakashkumarsingh_ttm/.gradle/wrapper/dists/gradle-8.3-all/6en3ugtfdg5xnpx44z4qbwgas/gradle-8.3/lib/kotlin-stdlib-common-1.9.0.jar!/META-INF/kotlin-stdlib-common.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.

The class is loaded from /Users/prakashkumarsingh_ttm/.gradle/wrapper/dists/gradle-8.3-all/6en3ugtfdg5xnpx44z4qbwgas/gradle-8.3/lib/kotlin-stdlib-1.9.0.jar!/kotlin/reflect/KClass.class

[MarineP31]

I've had the same errors and it was because I'd left some files still in java. Make sure you no longer have any java files :

• android/app/src/debug/java/com/[YOUR_APP_NAME]/ReactNativeFlipper.java => should be delete
• android/app/src/main/java/com/[YOUR_APP_NAME]/MainActivity.java => should be modify into kotlin file
• android/app/src/store/java/com/[YOUR_APP_NAME]/ReactNativeFlipper.java => should be delete
• etc...

[illestomas]

my workaround was to set in gradle-wrapper.properties back to
distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.1-all.zip
and in build.gradle add kotlinVersion = "1.8.0" to buildscript.ext

[illestomas]

upgrading @react-native/gradle-plugin solves the issue as well, no need to downgrade gradle to 8.0.1

So the final configuration:

gradle-wrapper.properties:

distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-all.zip

build.gradle:

kotlinVersion = "1.8.0"

package.json:

"@react-native/gradle-plugin": "0.73.4",

[gkasireddy202]

Hi,
I upgraded my project from 0.68.7 to 0.73.2. I am getting the below error on Android.
I do not want to upgrade my libraries in package.json
The project is using an incompatible version (AGP 8.1.1) of the Android Gradle plugin. Latest supported version is AGP 7.2.1.

[WinstonLeonard]

I've had the same errors and it was because I'd left some files still in java. Make sure you no longer have any java files :

• android/app/src/debug/java/com/[YOUR_APP_NAME]/ReactNativeFlipper.java => should be delete
• android/app/src/main/java/com/[YOUR_APP_NAME]/MainActivity.java => should be modify into kotlin file
• android/app/src/store/java/com/[YOUR_APP_NAME]/ReactNativeFlipper.java => should be delete
• etc...

How do we modify into kotlin file

[gkasireddy202]

I resolved this issue by changing the namespace in appname/android/app/build.gradle
namespace "com.appname"

[rrrgho]

upgrading @react-native/gradle-plugin solves the issue as well, no need to downgrade gradle to 8.0.1

So the final configuration:

gradle-wrapper.properties:

distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-all.zip

build.gradle:

kotlinVersion = "1.8.0"

package.json:

"@react-native/gradle-plugin": "0.73.4",

This solved my issue.