diff --git a/app/controllers/user_admin_controller.rb b/app/controllers/user_admin_controller.rb
--- a/app/controllers/user_admin_controller.rb
+++ b/app/controllers/user_admin_controller.rb
@@ -61,6 +61,7 @@
 
     note = []
     error_note = []
+    error_msg = nil
     ok_user = []
 
     lines.split("\n").each do |line|
@@ -76,7 +77,7 @@
           password = items[2].chomp(" ")
         else
           password = random_password
-          add_random_password=true;
+          added_random_password=true;
         end
 
         if items.length>= 4 and items[3].chomp(" ").length > 0;
@@ -96,11 +97,11 @@
           user.remark = remark
         else
           user = User.new({:login => login,
-                            :full_name => full_name,
-                            :password => password,
-                            :password_confirmation => password,
-                            :alias => user_alias,
-                            :remark => remark})
+                           :full_name => full_name,
+                           :password => password,
+                           :password_confirmation => password,
+                           :alias => user_alias,
+                           :remark => remark})
         end
         user.activated = true
 
@@ -112,7 +113,8 @@
           end
           ok_user << user
         else
-          error_note << "#{login}"
+          error_note << "'#{login}'"
+          error_msg = user.errors.full_messages.to_sentence unless error_msg
         end
 
       end
@@ -127,11 +129,13 @@
     end
 
     # show flash
-    flash[:success] = 'User(s) ' + note.join(', ') + 
-      ' were successfully created.  ' +
-      '( (+) - created with random passwords.)'   
+    if note.size > 0
+      flash[:success] = 'User(s) ' + note.join(', ') + 
+        ' were successfully created.  ' +
+        '( (+) - created with random passwords.)'   
+    end
     if error_note.size > 0
-      flash[:error] = "Following user(s) failed to be created: " + error_note.join(', ')
+      flash[:error] = "Following user(s) failed to be created: " + error_note.join(', ') + ". The error of the first failed one are: " + error_msg;
     end
     redirect_to :action => 'index'
   end
diff --git a/app/views/groups/show.html.haml b/app/views/groups/show.html.haml
--- a/app/views/groups/show.html.haml
+++ b/app/views/groups/show.html.haml
@@ -21,11 +21,13 @@
             %li
               If you want to add several users to a group, it may be easier to just re-import those users in 
               = link_to 'New list of users', new_list_user_admin_index_path
-              page
+              page. You can also use 
+              = link_to 'Bulk Manage User', bulk_manage_user_admin_index_path
+              page.
           =form_tag add_user_group_path(@group), class: 'form-inline' do
             .form-group
               =label_tag :user_id, "User"
-              =select_tag :user_id, options_from_collection_for_select(User.all,'id','full_name'), class: 'select2'
+              =select_tag :user_id, options_from_collection_for_select(User.all,'id','full_name'), class: 'select2', style: 'width: 10em';
             =submit_tag "Add",class: 'btn btn-primary'
 
 
@@ -52,12 +54,12 @@
           %ul
             %li
               If you want to add several problem to a group, it may be easier to bulk manage them in the
-              = link_to 'Bulk Manage', manage_problems_path
+              = link_to 'Bulk Manage Problems', manage_problems_path
               page
           =form_tag add_problem_group_path(@group), class: 'form-inline' do
             .form-group
               =label_tag :problem_id, "Problem"
-              =select_tag :problem_id, options_from_collection_for_select(Problem.all,'id','full_name'), class: 'select2'
+              =select_tag :problem_id, options_from_collection_for_select(Problem.all,'id','full_name'), class: 'select2', style: 'width: 10em';
             =submit_tag "Add",class: 'btn btn-primary'