Magento 1.9 - CMS page products list error

[Aveeva]

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

[Rahul Gupta]

@Aveeva use this <?php $_helper = Mage::helper('catalog/output'); ?>

You are calling the function using helper but you don't have created the helper instance.

Thanks

[Aveeva]

@rahul Gupta  How to add more than one category,

{{block type="catalog/product_bestseller" template="catalog/product/bestseller.phtml" category_id="16"}}

If i add like,

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

<br>

{{block type="catalog/product_bestseller" template="catalog/product/bestseller.phtml" category_id="16"}}

<br>

{{block type="catalog/product_bestseller" template="catalog/product/bestseller.phtml" category_id="10"}}  

Displayed same category (5)

[Rahul Gupta]

@Aveeva you can pass like this.

{{block type="catalog/product_bestseller" template="catalog/product/bestseller.phtml" category_id="5,16,10"}}

In this way you can get array of category_id and then you can use them one by one.

Thanks

[Aveeva]

@rahul Gupta Yes, i tried this. Same category list showing for all products.

[Rahul Gupta]

@Aveeva after this on your template file where your are getting the category id now you are getting the array there?

[Aveeva]

@rahul Gupta  This is the tutorial i am following, https://mercytapscott.com/display-bestsellers-for-specific-magento-categories/ 

[Rahul Gupta]

@Aveeva i have checked this.

In this where you are getting the category you have to apply that code inside foreach loop for categories array.

Thanks

[Aveeva]

@rahul Gupta  In the cms page content section i am added my category id. I am shared tutorial link what i followed.

can you pls explain in detail :  inside foreach loop for categories array.