Uso de erorr constante indefinido en php

Recibo errores (mencionados a continuación en el código) cuando cambié mi código a otro sistema,

Configuraciones:

SO: Windows 7 php server: Xampp

Porfavor ayudame a resolver este problema. gracias por adelantado.

CÓDIGO:

<?php
class settings{
    public $theme;
    public $db_pf;

    function __construct(){
        $this->theme="default";
        $this->db_pf="task_";
        $this->paths();
        $this->abbr();
        $this->errors();

        $this->enable_db_config();
    }
    function paths(){
        define(ROOT,$_SERVER['DOCUMENT_ROOT']);
        define(BP,"/task/");
        define(ABSPATH,"/task/ta-admin/");
        define(ADMPATH,"/task/administrator/");
        define(INCLUDE_PATH,ABSPATH."includes/");
        define(MODULE_PATH,ABSPATH."modules/");
        define(CONTENT_PATH,ABSPATH."contents/");
        define(THEME_PATH,ABSPATH."templates/".$this->theme."/");
        define(STYLE_PATH,THEME_PATH."styles/");
        define(IMAGE_PATH,THEME_PATH."images/");
        define(JS_PATH,BP."assets/js/");
        define(JQ_PATH,BP."assets/jq/");
    }
    function enable_db_config(){
        include(ROOT.BP."ta-includes/class-db-config.php");
    }
    function abbr(){
        define(task_title,"Admin-Quit Tasker-");
        define(LOGIN_TITLE," Administrator Login...");
        define(SLOGAN,"Enabling Solutions to your Tasks...");
    }
    function errors(){
        define(NOTFOUND,"Page not found");
        define(GOBACK," please press ok to go back...");    
    }
}
$obj_settings=new settings();
?>

ERRORES:

Notice: Use of undefined constant ROOT - assumed 'ROOT' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 14

Notice: Use of undefined constant BP - assumed 'BP' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 15

Notice: Use of undefined constant ABSPATH - assumed 'ABSPATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 16

Notice: Use of undefined constant INCLUDE_PATH - assumed 'INCLUDE_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 17

Notice: Use of undefined constant CONTENT_PATH - assumed 'CONTENT_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 18

Notice: Use of undefined constant THEME_PATH - assumed 'THEME_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 19

Notice: Use of undefined constant STYLE_PATH - assumed 'STYLE_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 20

Notice: Use of undefined constant JS_PATH - assumed 'JS_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 21

Notice: Use of undefined constant JQ_PATH - assumed 'JQ_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 22

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