SP.SOD in the Masterpage

In a SP Online in the masterpage, I have a JS file that calls the following in document.ready.

SP.SOD.executeFunc('sp.runtime.js', null, function(){           
      SP.SOD.executeFunc('sp.js', null, function(){               
           SP.SOD.executeFunc('sp.publishing.js', null,GetNavigation);        
      });    
});

The code fails right in the first SP.SOD call.

I'm I using wrongly the SP.SOD? is there a step by step example how to use the SP.SOD in JS file associated to a masterpage?

Thank you