Use of undefined constant result - assumed 'result'

class UserDB implements IUserDB{
 
    const DB_NAME = "news.db";
    private $_db = null;
 
    function __get($name){
 
        if ($name == "_db")
            return $this->_db;
        throw new Exception("Unknown property!");
    }
 
    function __construct(){
 
        $this->_db = new SQLite3(self::DB_NAME);
        if(filesize(self::DB_NAME)==0){
            
    try{
            $sql = "CREATE TABLE users(id INTEGER PRIMARY KEY AUTOINCREMENT, username TEXT, email TEXT, password INTEGER)";
 
            if (!$this->_db->exec($sql)) 
                throw new Exception($this->_db->lastErrorMsg());
 
            
            } catch(Exception $e){
 
                    //$e->getMassage();
                    echo "Everything is bad :(";
 
            }
        }
 
 
    }
 
    function __destruct(){
 
        unset($this->_db);
    }
 
 
    function createUser($username, $password) {
 
        $sql = "INSERT INTO users(username, password) VALUES('$username',  '$password')";
        $result = $this->_db->exec($sql);
        if (!result) throw new Exception("Error with connection");
 
        
    }

<?php
 
 
 
 $userName = $_POST['username'];
 
 $userPass = $_POST['password'];
 
 if (empty($userName) or empty ($userPass)) {
    
    $errMsg = "Fill in all the fields of the form!";
 }else{
 
    if (!$user->createUser($userName, $userPass))  {
     $errMsg = "An error occurred while adding user";
    }else{
 
        header("Location: login.php");
        exit; 
    }
 }