Magento 1.9 - CMS page products list error

Question

Display Bestsellers for Specific Magento Categories in CMS page.

Following tutorial,

https://mercytapscott.com/display-bestsellers-for-specific-magento-categories/

Added following line into cms content

{{block type="catalog/product_bestseller" template="catalog/product/bestseller.phtml" category_id="5"}}

Getting error.

My code :

app/code/local/Mage/Catalog/Block/Product/Bestseller.php app/design/frontend/default/theme/template/catalog/product/bestseller.phtml

If any configuration error or anything else?

error message : 

Fatal error: Call to a member function productAttribute() on null in /home/abc/public_html/app/design/frontend/default/theme/template/catalog/product/bestseller.phtml on line 6

Answer 1

open below file and declare of helper after flush and check it.

app/design/frontend/default/theme/template/catalog/product/bestseller.phtml

$_helper = Mage::helper('catalog/output');