What *exactly* does "Configure Kotlin" mean?

I just tried to convert a java file using Code->Convert Java File to Kotlin File and got series of messages, the first telling me to "Configure Kotlin", and offering me a choice to "Configure Kotlin in Project " which just leads to a pop-up telling me "There are no configurators available".

However, Tools->Kotlin->Configure Kotlin in Project then tells me "All modules with Kotlin have been configured".

This is a brand new (as in, minutes old) project generated by IntJ with a Kotlin DSL gradle script that is mostly unchanged:

plugins {
    kotlin("jvm") version "1.3.72"
}

repositories { mavenCentral() }

dependencies {
    implementation(kotlin("stdlib-jdk8"))
}

sourceSets["main"].java.srcDir("src")

tasks {
    compileKotlin {
        kotlinOptions.jvmTarget = "1.8"
    }
    compileTestKotlin {
        kotlinOptions.jvmTarget = "1.8"
    }
}

All I've done there is tweak the default source path.  I then placed a handful of kotlin files there and one in java, which I tried to convert but learned kotlin is not configured for the project, but asking the IDE to help "Configure Kotlin in Project" tells me it is already done o_O?

Everything including the java file (which, if it matters, is in the same directory as the kotlin sources) builds fine both in the IDE and via CLI gradlew.  I have used java -> kotlin conversion before without any hitches, dunno what the choking is about now.