Ajax gives an Error while posting in intel XDK JQuery Mobile development

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Ajax

jQuery

This is the Ajax codes the following return an error message for some reason; I read online on the cross sit scripting but i wasn't able to make sense of it and how it affects Ajax in JQuery mobile app

$.ajax({
                   url: "localhost:90/wizzy/php/main.php",
                   type: "POST",
                   dataType: "text",
                   crossDomain: true,
                   data: {tag:"1"},
                   dataType: "text",
                   contentType: 'application/json',
                   mimeType: 'application/json',
                   cache: false,
                   success: function(response, status){alert("hhh");},
                   error:  function(XMLHttpRequest, textStatus, errorThrown){
                        alert("textStatus:"+textStatus+",errorThrown:"+errorThrown+",XMLHttpRequest:"+XMLHttpRequest);}
               });

The particular error itself can not be determined all that is shown is the alert box in the error function and no error message comes with it