NoClassDefFound when trying to debug using default generated launch.json

Using Ktor web server with the following main
```kotlin

@UseExperimental(KtorExperimentalAPI::class)
fun main(args: Array) {
val server = embeddedServer(CIO, 8080, module = Application::module)
server.start(wait = true)
}

```


Start by reproducing the failure with the default generated launch.json and the Ktor main function shown in the issue. Trace the generated debug configuration and the NoClassDefFound error, then verify that the same application can be debugged successfully without the missing-class failure.

Written by the indexing model from the issue text.