Updating project to stable coroutines Kotlin 1.3.0 + Coroutines 1.0.0 error

You're missing the standard library in your dependencies. The plugin inspects that to figure out what version of the api to use.

Add "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" as a dependency to fix your error.

Right click on project name -> Maven -> Reimport. In my case it has helped.

What worked for me with IntelliJ 2019.2.1 + Gradle

File => Project Structure

Then from the Project Settings Dialog select Modules and for each Kotlin module ensure the Language version and the API version matches. Unfortunately these settings get reset after every Gradle sync so you have to repeat the process after every Gradle sync.

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