Cant find the assembly reference for xmlns:local in my project

Hi friends,

I am trying to build an application, where i was ended up with the following error

Error:

Assembly must be specified for XAML files that are not part of a project. Reopen this XAML file after adding it to a project, close this file and reopen it using the project it is associated with, or modify the clr-namespace to include the name of the assembly.

My code snippet is

<StackPanel 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:ABC.XXX.YYY.Silverlight.Controls"
    xmlns:login="clr-namespace:ABC.XXX.YYY.Silverlight.LoginUI"
    x:Class="ABC.XXX.YYY.Silverlight.LoginUI.LoginForm"
    KeyDown="LoginForm_KeyDown"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d"
    d:DataContext="{d:DesignInstance Type=login:LoginInfo}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
<local:BusyIndicator x:Name="busyIndicator" BusyContent="{Binding Path=ApplicationStrings.BusyIndicatorLoggingIn, Source={StaticResource ResourceWrapper}}" IsBusy="{Binding IsLoggingIn}">
     <StackPanel Orientation="Vertical">
         <local:CustomDataForm x:Name="loginForm"
                                      Padding="10,0,10,0"
                                      CurrentItem="{Binding}"
                                      IsEnabled="{Binding IsLoggingIn, Converter={StaticResource NotOperatorValueConverter}}" AutoEdit="True" CommandButtonsVisibility="None" HeaderVisibility="Collapsed"                                       AutoGeneratingField="LoginForm_AutoGeneratingField" Style="{StaticResource LoginDataFormStyle}" /> </StackPanel>

In the above code,

xmlns:local="clr-namespace:ABC.XXX.YYY.Silverlight.Controls"
xmlns:login="clr-namespace:ABC.XXX.YYY.Silverlight.LoginUI"

is showing the above mentioned error.
I googled about the error, they are asking to add a reference.
If I should, where would i get appropriate reference library in my application?
Please help me ASAP.
Any ideas will be greatly appreciated.

Tags: XML, HTML, Silverlight