java.lang.NoClassDefFoundError: org/jetbrains/kotlin/config/KotlinCompilerVersion

I’m getting a NoClassDefFoundError on a class that should be part of the JSR223 package and/or its dependencies. The code is here if anyone is interested. I’m trying to add Kotlin JSR223 support to Apache NiFi. Any insight would be appreciated as I’m a total newb to Kotlin.