Fatal Error in category.php (VM 2.0.24b)

[SteP[IT]]

After upgrading from 2.0.24a to 2.0.24b the website frontend does not load anymore: turning on errors, it arises this error:

Fatal error: Using $this when not in object context in D:\<site path>\administrator\components\com_virtuemart\models\category.php on line 121

Could you please help us to address and fix the error? To have the site working we had to downgrade to the previous 24a version

Thank you in advance
Regards

[Darus]

Step could you detail the downgrade procedure please. Same issue on my site.

[SteP[IT]]

Simply download the 24a version, and install it using standard Joomla installer.

[Darus]

Thank You Step.

[jenkinhill]

The error indicates that the aio component has not been updated, as you must update the modules, too. 
Alternatively you are using a modified/third party category module which needs updating. The following is from the liveupdate info:

please search for
JFactory::getCache and delete this line. If you are unsure about this, you can skip this step.

Search also for
$cache->call( array( 'VirtueMartModelCategory', 'getChildCategoryList' ),$vendorId, $category->virtuemart_category_id );
and replace it by
VmModel::getModel('category')->getChildCategoryList($vendorId, $category->virtuemart_category_id );

Be aware it can be also $child instead of $category. the part behind getChildCategoryList stays the same. This change enhances in some stores drastically the speed. For more information or if you need help, you may read here http://forum.virtuemart.net/index.php?topic=120284#msg410104

[Milbo]

or read here please
http://forum.virtuemart.net/index.php?topic=120284.msg410104#msg410104