I have changed my etc/system.xml and my etc/config.xml with the structure which should replace the Mage_JaviNewListProductController_Helper_Data by Lecasa_JaviNewListProductController_Helper_Data.

I am getting the following error:

Fatal error: Class 'Mage_JaviNewListProductController_Helper_Data' not found in /home/javiertxu/Documentos/webs/clon_lecasa/app/Mage.php on line 547

This is the system.xml file

This is the config.xml file

And this is the data helper of my module

I do not know what more I can change for replace the Mage_ by the parent name of my module when I use:


I think that this has not relevance but I am using this function in rwd/default/template/.../list.phtml

Active module Thanks

  • check your upper-lowercase-writing, that's inconsitsent. Mage::helper('javinewlistproductcontroller') should be correct in my opinion
    – HelgeB
    Commented Feb 22, 2019 at 10:16
  • try Mage::helper('javinewlistproductcontroller')->renderProductInCatalog($_product);
    – Zefiryn
    Commented Feb 22, 2019 at 10:17
  • @Zefiryn I have replace it by lowercase but the error is the same. The issue here is the Mage_ prefix. I would like to read more of your suggestions. Thanks Commented Feb 22, 2019 at 10:23
  • @HelgeB thanks for your answer, but the Mage_ prefix continues appearing. I have change it to lowercase, but I think that the problem is with some element of the configuratios. I wait for another suggestion. Thanks.. Commented Feb 22, 2019 at 12:47
  • Is your module enabled (i.e. xml file in etc/modules and tag active true)?
    – HelgeB
    Commented Feb 22, 2019 at 12:57

1 Answer 1


To summarize the discussion in the comments you have to change the following in order to get your code working:

File /etc/modules/Lecasa_Javinewlistproductcontroller.xml must have this content (the tag below <modules> has to be identical with that used in config.xml and should correspond with the naming of the path to your modules folder if you replace _ with /):

<?xml version="1.0"?>

With this done your module will be found by Magento and you can access the helper'S method with:


The identifier for your helper is the tag name below <helpers> in your config.xml.

I hope that will help you to get your module work.

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