i have magento 1.5 and i want to display new products Filter by Category Ids. I had try by `->addCategoryFilter($categoryId);`
 But not working...

I also try [this](http://blog.chapagain.com.np/magento-how-to-filter-product-collection-using-2-or-more-category-filters/) tips, which exactly i want by (Category ids). but it give me error of: "Invalid attribute Category\_ids"...

SO can any one display new products in magento by list of Category ids....?