Problem with Categories - Fatal error

Hi,

I initially upgraded one of my installations to Perch 2.6.2 as I was interested in testing out the new categories element. However, after just trying to complete a simple test (add set + categories and then render), I got the following message:

Fatal error: Using $this when not in object context in E:\KDL_Projects_Open\kdl_mtc\www\admin\core\apps\categories\PerchCategories_Categories.class.php on line 102

As I have a forthcoming project anyway, I purchased another new licence of Perch 2.6.2 and did a complete clean install. I then just added a single set with some categories and added:

<?php perch_categories(); ?>

to the example page, to provide a quick simple test that everything was working.

Again, it produced the above error.

Any ideas why this is happening.

I have placed below the small diagnostic report, in-case there is something to be gleaned from this.

Perch: 2.6.2, PHP: 5.3.5, MySQL: mysqlnd 5.0.7-dev - 091210 - $Revision: 304625 $, with PDO
Server OS: WINNT, apache2handler
Installed apps: content (2.6.2), assets (2.6.2), categories (2.6.2)
App runtimes: <?php $apps_list = array( 'content', 'categories', );
PERCH_LOGINPATH: /admin
PERCH_PATH: E:\KDL_Projects_Open\kdl_mtc\www\admin
PERCH_CORE: E:\KDL_Projects_Open\kdl_mtc\www\admin\core
PERCH_RESFILEPATH: E:\KDL_Projects_Open\kdl_mtc\www\admin\resources
Image manipulation: GD
PHP limits: Max upload 256M, Max POST 256M, Memory: 256M, Total max file upload: 256M
Resource folder writeable: Yes
HTTP_HOST: qm.kdl
DOCUMENT_ROOT: E:/KDL_Projects_Open/kdl_mtc/www
REQUEST_URI: /admin/core/settings/diagnostics/
SCRIPT_NAME: /admin/core/settings/diagnostics/index.php

Thanks,

Andy