I get this error when try to run my Android application and I am not using Kotlin at all, application is written in Java...
Class kotlin.reflect.jvm.internal.Fun
Install the latest version of Kotlin plugin: go to Settings Ctrl+Alt+S > Languages & Frameworks > Kotlin Updates > select Update channel > click [Check again]
My current Kotlin plugin version is 1.3.0-rc-57.
Execute Build > Clean Project to remove temporary gradle files.
File > Invalidate Caches / Restart...
After restarting Sync Project with Gradle files and Make Project (Ctrl+F9).
Will be fixed in Android Studio 3.3 Canary 14: https://issuetracker.google.com/issues/115798277
In the mean time, use Invalidate Caches/Restart
I solved it this way:
Settings -> Languages & Frameworks -> Kotlin Updates -> Update channel -> Early Access Preview/Stable -> Update -> Restart
Or:
Tools -> Kotlin -> Configure Kotlin Plugin Update -> Update channel -> Early Access Preview/Stable -> Update -> Restart