Functional interface conversion is disabled


Im using kotlin 1.4M1 and are getting the error:
the feature “functional interface conversion” is disabled.
How can I enable it?

Please make sure you’re using 1.4-M1 in IDE plugin and in compiler. For example, install the plugin and create a new Gradle project from the IDEA wizard. It should work (if the Kotlin language version for the project is 1.4, which it should be, if you’re using the 1.4 plugin).