JHTMLform not supported. Invalid Token

After you upgraded from Joomla! 1.5.0 to 1.5.2/1.5.3 you receive the error message JHTMLform not supported. Invalid Token. when trying to login to the backend. Or when trying to fill in a form or login on Front End you get Invalid Token or JHTMLform not supported. Invalid Token.

Follow the steps below in order to solve this problem

STEP 1

Locate the following path in your Joomla! installation in the root directory /libraries/joomla/html/html/and check if the file form.php is present.

STEP 2

If the file is missing create the file form.php in the /libraries/joomla/html/html/directory and add the code below in the form.php file.

CODE

<?php

/**
* @version $Id: form.php 9944 2008-01-14 21:10:22Z eddieajau $
* @package Joomla.Framework
* @subpackage HTML
* @copyright Copyright (C) 2005 – 2008 Open Source Matters. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/

/**
* Utility class for form elements
*
* @static
* @package Joomla.Framework
* @subpackage HTML
* @version 1.5
*/
class JHTMLForm
{
/**
* Displays a hidden token field to reduce the risk of CSRF exploits
*
* Use in conjuction with JRequest::checkToken
*
* @static
* @return void
* @since 1.5
*/
function token()
{
return ‘<input type=”hidden” name=”‘.JUtility::getToken().'” value=”1″ />’;
}

}

?>

STEP 3

Save the file and refresh your Joomla! page and the problem should now be solved.