diff --git a/frontend/frontend/static/frontend/assets/js/setup-tool-ext.js b/frontend/frontend/static/frontend/assets/js/setup-tool-ext.js
index 833aad9..ca18d7d 100644
--- a/frontend/frontend/static/frontend/assets/js/setup-tool-ext.js
+++ b/frontend/frontend/static/frontend/assets/js/setup-tool-ext.js
@@ -52,7 +52,9 @@ function updateSelector(name, messages) {
 
 // show status and error messages
 function updateUIMessages(data) {
-        
+    updateSelector('parent', data[0]);
+    for (name in data[1])
+        updateSelector(name, data[1][name]);
 }
 
 function updateUI(config) {
diff --git a/frontend/frontend/static/frontend/assets/js/setup-tool.js b/frontend/frontend/static/frontend/assets/js/setup-tool.js
index 62b6480..b01c5ab 100644
--- a/frontend/frontend/static/frontend/assets/js/setup-tool.js
+++ b/frontend/frontend/static/frontend/assets/js/setup-tool.js
@@ -406,7 +406,7 @@ function onCreateButtonClick() {
         //freeze UI
         loader(true);
         createFeed().then(function(data){
-            if (typeof(data) == 'string'))
+            if (typeof(data) == 'string')
 				window.location.href = data; // feed_page_url
 			else
 				ET.updateUI(data);
@@ -430,7 +430,7 @@ function createFeed() {
             $.ajax({
                 type: 'POST',
                 url: EI.active() ? "/setup_create_feed_ext" :"/setup_create_feed",
-                data: JSON.stringify(ET.active
+                data: JSON.stringify(ET.active()
                                      ? { selectors: ET.getUIConfig(), snapshot_time: snapshot_time, url:$('#create').data('page-url') }
                                      : { html: iframeHtmlJson, names: name_ids, url:$('#create').data('page-url') }
                                     ),
diff --git a/frontend/frontend/urls.py b/frontend/frontend/urls.py
index 53c3627..b59e308 100644
--- a/frontend/frontend/urls.py
+++ b/frontend/frontend/urls.py
@@ -29,3 +29,4 @@ urlpatterns = i18n_patterns(
 
 urlpatterns.append(url(r'^setup_get_selected_ids$', views.setup_get_selected_ids, name='setup_get_selected_ids'))
 urlpatterns.append(url(r'^setup_create_feed$', views.setup_create_feed, name='setup_create_feed'))
+urlpatterns.append(url(r'^setup_create_feed_ext$', views.setup_create_feed, name='setup_create_feed_ext'))
diff --git a/frontend/frontend/views.py b/frontend/frontend/views.py
index ce44180..5692e36 100644
--- a/frontend/frontend/views.py
+++ b/frontend/frontend/views.py
@@ -12,6 +12,7 @@ from .forms import IndexForm
 from .settings import DOWNLOADER_PAGE_URL, FEED_PAGE_URL, FEED1_PAGE_URL
 
 from .setup_tool import get_selection_tag_ids, build_xpathes_for_items
+from .setup_tool_ext import build_xpath_results
 from .models import Feed, Field, FeedField
 
 def index(request):
@@ -124,6 +125,49 @@ def setup_create_feed(request):
  
         return HttpResponse(reverse('preview', args=(feed_id,)))
 
+def _validate_selectors(selectors):
+    if not isinstance(selectors, list) or len(selectors) != 2:
+        return False
+    feed_xpath = xpathes[0]
+    item_xpathes = xpathes[1]
+
+    if not isinstance(feed_xpath, basestring):
+        return False
+
+    if not isinstance(item_xpathes, dict):
+        return False
+
+    fields = Field.objects.all()
+
+    item_xpathes_out = {}
+
+    for field in fields:
+        if field.name in item_xpathes:
+            if not isinstance(item_xpath[field.name], basestring):
+                return False
+            else:
+                item_xpathes_out[field.name] = item_xpath[field.name]
+    return [feed_xpath. item_xpathes_out]
+
+def setup_create_feed_ext(request):
+    if request.method == 'POST':
+        obj = json.loads(request.body)
+        if 'selectors' not in obj or 'snapshot_time' not in obj or 'url' not in obj:
+            return HttpResponseBadRequest('"selectors", "snapshot_time" and "url" parameters are required')
+
+        selectors = obj['selectors']
+        snapshot_time = obj['snapshot_time']
+        url = obj['url']
+
+        validated_selectors = _validate_selectors(selectors)
+
+        if not validated_selectors:
+            return HttpResponseBadRequest('selectors are invalid')
+
+        results = build_xpathes_results(validated_selectors, snapshot_time, url)
+
+        return HttpResponse(json.dumps(results))
+
 def preview(request, feed_id):
     if request.method == 'GET': 
         return render(request, 'frontend/preview.html',