Help me fix errors loading a xml file trying to pass a username from SharedObject

Im loading a dynamically named xml file and Im trying to pass a user name stored in a SharedObject that = putusername.text into a string to complete the url.

var galleryLoader:LoaderMax;
var url = "https:/www.mysite.com/";
var putusername = putusername.text;

var queue:XMLLoader = new XMLLoader(String(url)+(putusername)+"_myfile.xml",{name:"xmlDoc",
maxConnections:1,
estimatedBytes:5000,
onComplete:xmlCompleteHandler
});
queue.load();
Here is the Error:

Error on XMLLoader 'xmlDoc' (http://www.mysite.com/_myfile.xml): Error #2032: Stream Error. URL: http://www.mysite.com/_myfile.xml

Help me fix the error please