Gradle error upgrading to Android Studio 3.0 Beta 1

Question

Note: This seems to be an issue with the Android plugin. See comments for associated issues.

I get the following gradle error when building the project:

Answer 1

If clean and sync doesn't quite work for your Java+Kotlin-mixed project, it's possible that you need to change your Kotlin version to be consistent with the IDE supplied Kotlin version, which as of Android Studio 3.0 Beta 2 is 1.1.3-2. I was using 1.1.4 at the time and I found that I had drop it back down, did my clean and sync before it all works again, at which point I can move back to 1.1.4.