Can't access Categories from Admin panel

Hi folks,

Having some bother accessing the Categories section on Admin panel. When adding new products, I can't assign them to a category either - both are obviously linked.

From error logs:

[24-Jun-2014 10:47:07 Europe/London] PHP Fatal error: Call to undefined method ModelCatalogProduct::getProductTags() in /vqmod/vqcache/vq2-catalog_controller_product_product.php on line 369

Line 369:

$results = $this->model_catalog_product->getProductTags($this->request->get['product_id']);

Any ideas? Thanks in advance.

Go into vqmod-xml and remove all and replace one by one, I've had it do that a few times and with the one that affected category and products only it was like Admin panel upgrade mod etc.