Get "caption": "Authentication problem" when HttpPost to vaadin

I am trying to httpPost vaadin project url

String url = "http://localhost:8080/ProjectName/";
client = new DefaultHttpClient();
HttpPost request = new HttpPost(url + parameter); // here you put the entire URL with the GET parameters
HttpResponse response = client.execute(request);
// from here is postprocessing to handle the response, in my case JSON

       BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
       String line = "";
       StringBuilder sb = new StringBuilder("");

       while ((line = rd.readLine()) != null) {
           sb.append(line);
       }

Returning string is like below.

Why always returning
: "caption": "Authentication problem", and : "caption": "Communication problem" . ???
What do i have to do to overcome these problems?

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=11;chrome=1">
<title>ProjectName</title>
<style type="text/css">html, body {height:100%;margin:0;}</style>
<link rel="shortcut icon" type="image/vnd.microsoft.icon" href="./VAADIN/themes/dashboard/favicon.ico">
<link rel="icon" type="image/vnd.microsoft.icon" href="./VAADIN/themes/dashboard/favicon.ico">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<link rel="apple-touch-icon" href="/ProjectName/VAADIN/themes/dashboard/img/app-icon.png">
</head>
<body scroll="auto" class=" v-generated-body">
<div id="ProjectName-136206756" class=" v-app dashboard">
<div class=" v-app-loading"></div>
<noscript> You have to enable javascript in your browser to use an application built with Vaadin. </noscript>
</div>
<script type="text/javascript" src="./VAADIN/vaadinBootstrap.js"></script>
   <script type="text/javascript">//<![CDATA[if (!window.vaadin) alert("Failed to load the bootstrap javascript: ./VAADIN/vaadinBootstrap.js");if (typeof window.__gwtStatsEvent != 'function')
   {vaadin.gwtStatsEvents = [];window.__gwtStatsEvent = function(event) {vaadin.gwtStatsEvents.push(event); return true;};}
   vaadin.initApplication("ProjectName-136206756",{ "authErrMsg": { "caption": "Authentication problem",
   "message": "Take note of any unsaved data, and <u>click here<\/u> or press ESC to continue." },
   "comErrMsg": { "caption": "Communication problem", "message": "Take note of any unsaved data, and <u>click here<\/u> or press ESC to continue." },
   "debug": true, "heartbeatInterval": 600, "serviceUrl": ".", "sessExpMsg": { "caption": "Session Expired", "message": "Session expired" },
   "standalone": true, "theme": "dashboard", "vaadinDir": "./VAADIN/", "versionInfo": {"vaadinVersion": "7.3.8"}, "widgetset": "com.ProjectName.WidgetSet"});//]]></script>
</body>
</html>

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Get "caption": "Authentication problem" when HttpPost to vaadin

Vaadin lets you build secure, UX-first PWAs entirely in Java.
Free ebook & tutorial.