Kotline Sum of positive number

Our task is to find in Kotline Sum of positive number in defined function. We written below code but getting compilation error. Hence need expertise advice for it -

import java.io.*
import java.math.*
import java.security.*
import java.text.*
import java.util.*
import java.util.concurrent.*
import java.util.function.*
import java.util.regex.*
import java.util.stream.*
import kotlin.collections.*
import kotlin.comparisons.*
import kotlin.io.*
import kotlin.jvm.*
import kotlin.jvm.functions.*
import kotlin.jvm.internal.*
import kotlin.ranges.*
import kotlin.sequences.*
import kotlin.text.*

fun sum(nums:Array<Int>,add: (acc:Int,ele:Int) -> Int):Int {
      var res=0
    for(i in nums){
        res = add(res,i)
    return res

--Editable Code---
fun getLambda(): (acc:Int,ele:Int) -> Int {
    var lambda = { acc: Int, ele: Int -> acc + ele }
    return lambda

fun main(args: Array<String>) {
    val numsCount = readLine()!!.trim().toInt()

    val nums = Array<Int>(numsCount, { 0 })
    for (i in 0 until numsCount) {
        val numsItem = readLine()!!.trim().toInt()
        nums[i] = numsItem
    val lambda = getLambda()
    val result = sum(nums,lambda)