Как исправить это?

$this->_db->exec($sql) or die($this->_db->lastErrorMsg());

<?php
require 'INewsDB.class.php';
class NewsDB implements INewsDB {
    protected $_db;
    const DB_NAME ='C:\Users\User\Desktop\OpenServer\domains\localhost\php-3\news.db';
    function __construct(){
        if(is_file(self::DB_NAME)){
        $this->_db = new SQLite3(self::DB_NAME);
        }
        else{
           $this->_db = new SQLite3(self::DB_NAME);
           $sql = "CREATE TABLE msgs(
                                id INTEGER PRIMARY KEY AUTOINCREMENT,
                                title TEXT,
                                category INTEGER,
                                description TEXT,
                                source TEXT,
                                datetime INTEGER)";
        $this->_db->exec($sql) or die($this->_db->lastErrorMsg());
        $sql = "CREATE TABLE category(
                            id INTEGER,
                            name TEXT)";
        $this->_db->exec($sql) or die($this->_db->lastErrorMsg());
        $sql = "INSERT INTO category(id, name)
                SELECT 1 as id, 'Политика' as name
                 UNION SELECT 2 as id, 'Культура' as name
                UNION SELECT 3 as id, 'Спорт' as name";
        $this->_db->exec($sql) or die($this->_db->lastErrorMsg());
        }
    }
    function __destruct(){
        unset($this->_db);
    }
    function clearStr($data){
        $data = trim(strip_tags($data));
        return $this->_db->escapeString($data);
    }
    function clearInt($data){
        return abs((int)$data);
    }
    function saveNews($title, $category, $description, $source){
        $dt = time();
        $sql = "INSERT INTO msgs(title, categories, description, source, datetime)
                VALUES ('$title', '$category', '$description', '$source', $dt)";
        $this->_db->exec($sql) or die($this->_db->lastErrorMsg());
    }
    function getNews(){}
    function deleteNews($id){}
   }
?>