Updated to Android Studio 3.0. Getting a "Kotlin not configured" error

Question

I just updated to Android Studio 3.0 and I'm getting this error with an existing project:

Kotlin not configured

When I go to Tools>Kotlin>Configure Kotlin in Project, I get an error saying "no configurators available". Also get the error below with the red java:

I've also tried:

• Restarting
• Clean and Rebuild
• Invalidate caches/restart.

Solution 1

I first tried with invalidate cache/ restart option but it doesn't help me.

When I updated Kotlin to 1.1.60 in project's gradle file, problem is solved.

Also, use this in app's gradle for stdlib

implementation "org.jetbrains.kotlin:kotlin-stdlib:1.1.60" 

instead of

implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:1.1.60"

Solution 2

In Android Studio, click on File -> Invalidate Caches / Restart... , then select "Invalidated and Restart". This solved my problem.

Solution 3

This error also occurs if you have the mavenCentral() repository missing in allprojects. Your build.gradle (:app) should contain at least this:

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

jcenter() would work as well (for now), but that repository reached end-of-life and shouldn't be used any more.

Solution 4

Kotlin-stdlib-jre7 is deprecated since 1.2.0 and should be replaced with kotlin-stdlib-jdk7

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

Solution 5

Closing and restarting Android Studio works for me in that case. Important is that there are no other projects opened in Android Studio before you close it. I suspect that closing Android Studio with multiple opened project windows sometimes messes up the configuration especially after plugin upgrades etc.

View more solutions

Comments

[bearlysophisticated]

Try a clean build from CLI, it worked for me: close Android Studio and run ./gradlew clean assembleDebug then start Android Studio again.

[vortek]

File -> Sync Project with Gradle files worked for me ...

[Martin]

A few lines of context to know where the line goes would have been nice.

[Martin]

A few lines of context to know where the line need to be replaced would have been nice.

[johnml1135]

This was very helpful to see it all laid out.

[AdamHurwitz]

I tried this which I thought resolved the issue. However, when I reverted to my original implementation implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version" the error was still resolved. I must of just needed to have the gradle file re0run.

[Zun]

This answer is not specific to Mac. It also worked on my Windows machine.

[garbus]

Thanks! Removing jre7 from dependency helped me to sync and finally build project with a new Kotlin version.

[benchuk]

saved my day! i had a bad csv plugin. once removed - everything was back to normal

[Mixno]

Thank you! Worked for me

[Joey Dalu]

This worked, thanks!