Could not find main method from given launch configuration. Kotlin

[bright dragon]

package test.pack

fun main() {
    println("Hello World in Kotlin")
     
}

In eclipse i have this.

When i File -> Export as runnable jar, it gives me this

Jar export finished with problems. See details for additional information.
Could not find main method from given launch configuration.

Oh, what to do ?!

[merry basalt]

Detected code, here are some useful tools:

[WARNING] The code couldn't end properly...

Problematic source code:

package test.pack

fun main() {
    println("Hello World in Kotlin")
     
}```
Cause:
The code doesn't compile:
illegal start of expression

## System out
[Nothing]

<@&1008423204219531294> please have a look, thanks.