What is the problem in this code?

Question

fun main(args: Array<String>) {
var age = readLine()!!toInt()
when {
age<0 -> println("Invalid Age")
age<=11 -> println("Child")
age<=17 -> println("Teen")
age<=64 -> println("Adult")
else -> println("Senior")
}
}

Answer 1

You forgot a period in the between the not-null assertion characters and the toInt method. It should be readLine()!!.toInt()

Answer 2

Thnx for your help