I'm getting this error at the end of the code please help Kotlin: A 'return' expression required in a function with a block body ('{...}')

here is what I have

import java.util.* fun main() { val board = Array(8) { Array(8) { "." } } // initialize board with dots var turn = "X" // player always starts first while (true) { clearScreen() // clear the console screen printBoard(board) // print current board if (checkWin(board, turn)) { // check if current player won println("$turn wins!") return } // get current player's move val move = if (turn == "X") getPlayerMove(board) else getComputerMove(board) // place current player's piece in the board for (row in 7 downTo 0) { if (board[row][move] == ".") { board[row][move] = turn break } } if (turn == "X") turn = "O" else turn = "X" // switch turn to the other player } } fun clearScreen() { print("\u001b[H\u001b[2J") // clear console screen } fun printBoard(board: Array>) { println("1 2 3 4 5 6 7 8") for (row in board) { for (cell in row) { print("$cell ") } println() } println("Select a column to place your piece (X):") } fun getPlayerMove(board: Array>): Int { while (true) { val scanner = Scanner(System.`in`) val input = scanner.nextInt() - 1 // adjust input to match array indices if (input in 0..7 && board[0][input] == ".") { // valid input return input } else { println("Invalid move. Please select a valid column.") } } } fun getComputerMove(board: Array>): Int { while (true) { val move = Random().nextInt(8) // generate random move if (board[0][move] == ".") { // valid move return move } } } fun checkWin(board: Array>, turn: String): Boolean { // check horizontal win for (row in board) { var count = 0 for (cell in row) { if (cell == turn) { count++ if (count == 4) { return true } } else { count = 0 } } } // check vertical win for (col in 0 until 8) { var count = 0 for (row in 0 until 8) { if (board[row][col] == turn) { count++ if (count == 4) { return true } } else { count = 0 } } } // check diagonal win (top-left to bottom-right) for (row in 0..4) { for (col in 0..3) { if (board[row][col] == turn && board[row + 1][col + 1] == turn && board[row + 2][col + 2] == turn && board[row + 3][col + 3] == turn ) { return true } } } // check diagonal win (bottom-left to top-right) for (row in 3 until 8) { for (col in 0..3) { } if (checkWin(board, turn)) { println("$turn wins!") return true // remove this line } } }