I'm facing this error while using Android studio 4.2 canary 3 and compose 0.1.0-dev14 with kotlin 1.4-M2 and getting this error while gradle building Class 'Kotlin.Unit' is compiled by a pre-release version of Kotlin and cannot be loaded by this version of the compiler. Any help is appreciated.

have you set the following in your gradle? you have to set the version https://developer.android.com/jetpack/androidx/releases/compose

Compose has some special extension set which is not supported by upstream compiler yet, so they use their own fork

@John O'Reilly if I use 1.4-M1, still get same error. Any solution? Or we just need to wait because 1.3.70 depends on 1.4-M2?

You can only use compose with the version of kotlin that matches our kotlin fork (this is temporary). At the moment this is 1.3.70

Thanks. working now with 1.3.70