diff --git a/xos/core/xoslib/spec/xoslib/xos-helper.test.js b/xos/core/xoslib/spec/xoslib/xos-helper.test.js
new file mode 100644
index 0000000..3ae47b9
--- /dev/null
+++ b/xos/core/xoslib/spec/xoslib/xos-helper.test.js
@@ -0,0 +1,48 @@
+'use strict';
+
+describe('The Xos Helper', () => {
+  var f;
+  beforeEach(() => {
+    f = jasmine.getFixtures();
+    f.fixturesPath = 'base/spec/xoslib/fixtures/xos-utils';
+  });
+
+  describe('XOSDetailView', () => {
+
+    describe('onFormDataInvalid', () => {
+
+      // TODO capire come applicare le funzioni di xosHelper su un template adHoc
+
+      const err = {name: "must start with mysite_"};
+      var view;
+      beforeEach(() => {
+        console.log('ciao');
+        f.set(`
+          <script tpye="text/template" id="fake-template">
+            <div>
+              <input name="name" />
+            </div>
+          </script>
+        `);
+        console.log('zio');
+
+        view = XOSDetailView.extend({
+          template: '#fake-template'
+        });
+        console.log('************' + view);
+      });
+
+      it('should show an error', () => {
+
+        console.log(view);
+
+        view.onFormDataInvalid(err);
+
+
+        expect($('.alert').length).toBe(1);
+      });
+    });
+
+  });
+
+});
\ No newline at end of file
diff --git a/xos/core/xoslib/static/js/xoslib/xosHelper.js b/xos/core/xoslib/static/js/xoslib/xosHelper.js
index 16046ae..f0b72b3 100644
--- a/xos/core/xoslib/static/js/xoslib/xosHelper.js
+++ b/xos/core/xoslib/static/js/xoslib/xosHelper.js
@@ -673,12 +673,17 @@
               },
 
             onFormDataInvalid: function(errors) {
+
+
                 var self=this;
+
                 var markErrors = function(value, key) {
                     var $inputElement = self.$el.find("[name='" + key + "']");
                     var $inputContainer = $inputElement.parent();
                     //$inputContainer.find(".help-inline").remove();
-                    var $errorEl = $("<span>", {class: "help-inline error", text: value});
+                    // var $errorEl = $("<span>", {class: "help-inline error", text: value});
+                    $inputContainer.find(".alert.alert-danger").remove();
+                    var $errorEl = $("<span>", {class: "alert alert-danger", text: value});
                     $inputContainer.append($errorEl).addClass("error");
                 }
                 _.each(errors, markErrors);