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I uploaded an image, please see attached.

So my module's folder name is: 'recommended_products_custom

The main module's file name is: recommended_products_custom.php (the same as folder name + .php)

The main module's file class name is: Recommended_Products_Custom 

The front controller file name is: ajax.php and class name: Recommended_Products_CustomAjaxAjaxModuleFrontController when it should have been Recommended_Products_CustomAjaxModuleFrontController (only one Ajax word).

And to my surprise it still does not work. Even after addint parent::initContent(); and such. Looks like I found the naming problem and it still didn't solve this, just wow.
 

And wow I made a big mistakae my front controller class name is 

Thanks guys for trying to help me