<RunTime Error when trying to take String input us...

# stackoverflow

[user]

RunTime Error when trying to take String input using readLine in Kotlin
I am a beginner in kotlin and this is the code I tried to execute, but runtime error is being displayed. Please help me resolve this.
import java.util.*
fun main(args: Array)
{
var inp = Scanner(System.in);
var t:Int = inp.nextInt();
repeat(t)
{
var n:Int = inp.nextInt();
var s:String = readLine()!!
for (i in s)
{
println(i);
}
println()

}
}

Exception in thread "main" kotlin.KotlinNullPointerException...