you need to add a dependency on the Kotlin plugin ...

# intellij-plugins

[yole]

you need to add a dependency on the Kotlin plugin to your project, and then you'll be able to use the APIs. you can find plenty of examples in the Kotlin plugin source code

[m]

Sorry, I stuck with following java.lang.ClassCastException: org.jetbrains.kotlin.psi.KtFile cannot be cast to org.jetbrains.kotlin.psi.KtFile when run my plugin in debug mode..

[m]

val psiFile = dataContext.getData(CommonDataKeys.PSI_FILE.name)
        
        val f = psiFile as KtFile