php - Magento "getCategories()" returns empty array -

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I am trying to list all the categories of the site using the following code: 

  Public Function ShowConcation Actions () {var_dump ($ this-> getCategories ()); }

However, this empty array is returning. I have several sites that are using the above code and they are returning category lists without any problems. I do not think so for this two special site. Their systems have categories and they are visible. Not sure what is wrong or how can I fix it.

Additionally, in other sites the system & gt; Configuration is there list , but what is not working is system & gt; Configuration & gt; List . I'm not sure there is a difference between these two.

Try it to get all the categories, 

  $ categories = Mage :: MillModel ('Catalog / Category') - & gt; GetCollection () - & gt; Add attitudes select ('*') - & gt; Add Efficient Filter ();

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