In a `build.gradle.kts` with ``` ... apply { p...
# gradle
h
In a
build.gradle.kts
with
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...
apply {
    plugin("kotlin")
    plugin("application")
}

val mainClassName = "com.github.holgerbrandl.Tester"
...
I get a
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Execution failed for task ':run'.
14:13:23.476 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] > No main class specified
why? How should I set
mainClassName
?