In Windows Phone7 I created an UserControl in which I am parsing some Data. Now I am not able to make instances of that Usercontrol.If I drag n drop the usercontrol the error occurs.

When I remove parsing from the Usercontrol I am able to make instances unless I am getting error such as

Code:
`"Cannot create instance of '<usercontrolname>' 
"XapCannotFindFileInPackage]
Arguments:HelpScreenData.xml 
Debugging Resource String are unavailable.Often the key and
arguments provide sufficient information to diagonise the problem.see
http://go.microsoft.com'/fwlink/?linkid=106663&version5.0.10411.00&
file=system.xml.dll&key=Xml_cannot find file in Xappackage"

And my UserControl is

Code:
public partial class ques : UserControl
{
    Popup popup = new Popup();
    tutorial tut = new tutorial();   //another usercontrol

    String[] str;
    String[] nam;
    public ques()
    {
        InitializeComponent();

   }
 private void UserControl_Loaded(object sender, RoutedEventArgs e)
    {

        LayoutRoot.Visibility = Visibility.Visible;

        buy_bac.Visibility = Visibility.Collapsed;
        buy_hme.Visibility = Visibility.Collapsed;
        buy_qestim.Visibility = Visibility.Collapsed;
        buy_piti.Visibility = Visibility.Collapsed;
        buy_qual.Visibility = Visibility.Collapsed;
        buy_rent.Visibility = Visibility.Collapsed;
        buy_rep.Visibility = Visibility.Collapsed;
        buy_mre.Visibility = Visibility.Collapsed;

        if (Modules.Programname == "Buyers")
        {
            buy_bac.Visibility = Visibility.Visible;
            buy_hme.Visibility = Visibility.Visible;
            buy_qestim.Visibility = Visibility.Visible;
            buy_piti.Visibility = Visibility.Visible;
            buy_qual.Visibility = Visibility.Visible;
            buy_rent.Visibility = Visibility.Visible;
            buy_rep.Visibility = Visibility.Visible;
            buy_mre.Visibility = Visibility.Visible;
        }
        XDocument doc = XDocument.Load("HelpScreenData.xml");
        string val = doc.ToString();

        XElement doc1 = doc.Descendants("buyer").First();

        var parsedPlist = doc1.Descendants("row");

        int i = 0;
        str = new string[parsedPlist.Count()];
        nam = new string[parsedPlist.Count()];
        foreach (XElement elem in parsedPlist)
        {
            nam[i] = (string)elem.Element("btn_name");
            str[i] = (string)elem.Element("string");
            i++;
        }
    }
    private void i1_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {


        if (nam[0] == buy_bac.Name)
        {


            Modules.msg = str[0];
            if (Modules.msg != null)
            {
                if (popup.IsOpen != true)
                {

                    popup.Child = tut;
                    popup.IsOpen = true;
                    popup.VerticalOffset = 200;
                    popup.HorizontalOffset = 50;
                    popup.IsOpen = true;
                    tut.lb_tut.Text = Modules.msg;
                }
                else
                {
                    popup.IsOpen = false;
                }
            }
            else if (nam[1] == buy_hme.Name)
            {
                Modules.msg = str[1];
                if (Modules.msg != null)
                {
                    if (popup.IsOpen != true)
                    {
                        popup.Child = tut;
                        popup.IsOpen = true;
                        popup.VerticalOffset = 400;
                        popup.HorizontalOffset = 50;
                        popup.IsOpen = true;
                        tut.lb_tut.Text = Modules.msg;
                    }
                    else
                    {
                        popup.IsOpen = false;
                    }
                }

            }
            else if (nam[1] == buy_qestim.Name)
            {
                Modules.msg = str[2];
                if (Modules.msg != null)
                {
                    if (popup.IsOpen != true)
                    {
                        popup.Child = tut;
                        popup.IsOpen = true;
                        popup.VerticalOffset = 400;
                        popup.HorizontalOffset = 50;
                        popup.IsOpen = true;
                        tut.lb_tut.Text = Modules.msg;
                    }
                    else
                    {
                        popup.IsOpen = false;
                    }
                }

            }
        }


    }

    private void i3_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        if (nam[2] == buy_piti.Name)
        {
            Modules.msg = str[3];
            if (Modules.msg != null)
            {
                if (popup.IsOpen != true)
                {
                    popup.Child = tut;
                    popup.IsOpen = true;
                    popup.VerticalOffset = 600;
                    popup.HorizontalOffset = 50;
                    popup.IsOpen = true;
                    tut.lb_tut.Text = Modules.msg;
                }
                else
                {
                    popup.IsOpen = false;
                }
            }

        }
        else if (nam[2] == buy_rent.Name)
        {
            Modules.msg = str[4];
            if (Modules.msg != null)
            {
                if (popup.IsOpen != true)
                {
                    popup.Child = tut;
                    popup.IsOpen = true;
                    popup.VerticalOffset = 600;
                    popup.HorizontalOffset = 50;
                    popup.IsOpen = true;
                    tut.lb_tut.Text = Modules.msg;
                }
                else
                {
                    popup.IsOpen = false;
                }
            }

        }
        else if (nam[2] == buy_qual.Name)
        {
            Modules.msg = str[5];
            if (Modules.msg != null)
            {
                if (popup.IsOpen != true)
                {
                    popup.Child = tut;
                    popup.IsOpen = true;
                    popup.VerticalOffset = 600;
                    popup.HorizontalOffset = 50;
                    popup.IsOpen = true;
                    tut.lb_tut.Text = Modules.msg;
                }
                else
                {
                    popup.IsOpen = false;
                }
            }

        }
        else if (nam[2] == buy_mre.Name)
        {
            Modules.msg = str[6];
            if (Modules.msg != null)
            {
                if (popup.IsOpen != true)
                {
                    popup.Child = tut;
                    popup.IsOpen = true;
                    popup.VerticalOffset = 600;
                    popup.HorizontalOffset = 50;
                    popup.IsOpen = true;
                    tut.lb_tut.Text = Modules.msg;
                }
                else
                {
                    popup.IsOpen = false;
                }
            }

        }
    }

The XML Parsed is

<?xml version="1.0" encoding="utf-8" ?>
<plist version="1.0">
<Main_Screen>
<row>
<btn_name>Buyer Programs</btn_name>
<string>Answer your client’s difficult .</string>
</row>
<row>
<btn_name>Seller’s Programs</btn_name>
<string>What do sellers want s needs.</string>
</row>
</Main_Screen>
<abssas>
<row>
<btn_name>dat Programs</btn_name>
<string> your client’s </string>
</row>
<row>
<btn_name>my Programs</btn_name>
<string> sellers want s needs.</string>
</row>
</abssas>
</plist>
What is the problem with this?