I'm converting calendar plugin to siena... and it still throws me "wrong url" error when I want to either view plugin or go to settings., I have no idea why. (even if the plugin consists of only standalone hook with echo inside)

here's the setup file... what am I doing wrong? I have no idea. it's the first time it happens to me.

EDIT: Okay, I just fixed it by taking a siena plugin and editing it.... it's strange. 

EDIT 2 : it was because in the old lang file was placed the check for COT_CODE ;/

<?php
/* ====================
[BEGIN_COT_EXT]
Code=calendar
Name=Calendar
Category=
Description=Description
Version=2.7.0
Date=2011-05-24
Author=Cotonti Team
Copyright=&copy; 2008-2012 Cotonti Team
Notes=
SQL=
Auth_guests=R
Lock_guests=A
Auth_members=R
Lock_members=A
Requires_modules=
[END_COT_EXT]

[BEGIN_COT_EXT_CONFIG]
cat=01:string::events:Pagecat
upcomingevent=03:select:0,1,2,3,4,5,6,7:3:Upcoming events days
[END_COT_EXT_CONFIG]
==================== */

/**
 * Calendar Plugin for Cotonti CMF
 *
 * @package calendar
 * @version 2.1
 * @author Cotonti Team
 * @copyright (c) 2008-2012 Cotonti Team
 * @license BSD
 */
 
 defined('COT_CODE') or die('Wrong URL');

?>