Warning “Kotlin plugin version is not the same as

I have an Android studio project in which I have added a Java library module, which I call core. My three Gradle build files look like this.

project/build.gradle

buildscript {
    ext.kotlin_version = '1.2.40'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

core/build.gradle

apply plugin: 'java-library'
apply plugin: 'kotlin'

dependencies { 
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7"
    ...
}

app/build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android { ... }

dependencies {
    implementation project(':core')
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.android.support:appcompat-v7:27.1.1'

    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    testImplementation 'junit:junit:4.12'
}

The problem I have is that, in core/build.gradle, the kotlin-stdlib-jdk7 line is giving me the warning Plugin version (1.2.40) is not the same as library version (jdk7-1.2.40). I have tried changing it to:

implementation "org.jetbrains.kotlin:kotlin-stdlib"

implementation "org.jetbrains.kotlin:kotlin-stdlib:1.2.40"

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.2.40"

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

But the warning is still there. The build still runs successfully, and I know I can surpress the warning without any problems and ignore it, but I really want to know why this is happening and how I can get rid of it. I am using Android Studio 3.0.1. Does anyone know of a solution to this?

This is a bug in the Kotlin plugin. I've filed an issue in the Kotlin issue tracker. You can simply ignore the message.

EDIT: JetBrains marked the issue as a duplicate of KT-23744 "Kotlin library and Gradle plugin versions are different" inspection false positive for non-JVM dependencies".