Not able to fetch Term store and related terms using JavaScript

I want to fetch termstore, Termsets and related terms. However, I'm not able to fetch the termstore.

I'm receiving the error message:

404 not found

This is the code I'm using:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>    
$(document).ready(function () {    
    var scriptbase = _spPageContextInfo.webServerRelativeUrl + "/_layouts/15/";    
    $.getScript(scriptbase + "SP.Runtime.js", function () {    
        $.getScript(scriptbase + "SP.js", function () {    
            $.getScript(scriptbase + "SP.Taxonomy.js", function () {
                 context = SP.ClientContext.get_current();

                 //Call your code here.
                 getTermStores();    
            });    
         });   
    });    
});

function getTermStores() {   
    session = SP.Taxonomy.TaxonomySession.getTaxonomySession(context);
    termStores = session.get_termStores();
    context.load(session);
    context.load(termStores);

    context.executeQueryAsync(function(){   
          termStoresEnum = termStores.getEnumerator();
          var termStores = "Term Stores: /n";

          while (termStoresEnum.moveNext()) {   
                var currentTermStore = termStoresEnum.get_current();
                var termStoreID = currentTermStore.get_id();  
                var termStoreName = currentTermStore.get_name();  
                termStores += "Name: " + termStoreName + " ID:" + termStoreID;  
         }   
    }, function(){    
          //failure loading termstores.    
    }); 
}  
</script>