error on contact form

[jake hathaway]

hello , i am getting this error message "At least one of the From or Sender fields is required, and neither was found."

i have added a contact form all the details are correct as far as i no please can someone check over them and help me fix this this is the web address to the page where the error is

http://www.onlinegamesleague.co.uk/j...o/contact.aspx

this is my source code

<%@ Page Title="Jake Hathaway's Portfolio l Contact Me"  MasterPageFile="MasterPage.master"
    AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default"  %>
     <% @Import Namespace="System.Web.Mail" %>
 
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
    <link rel="stylesheet" href="css/global.css">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
 
<script language="vb" runat="server">
    Sub btnSendFeedback_Click(ByVal sender As Object, ByVal e As EventArgs)
 
        'Create an instance of the MailMessage class
        Dim objMM As New MailMessage()
 
        'Set the properties - send the email to the person who filled out the
        'feedback form.
        objMM.To = "[e-mail]"
        objMM.From = txtEmail.Text
 
        'If you want to CC this email to someone else, uncomment the line below
        'objMM.Cc = "[e-mail]"
 
        'If you want to BCC this email to someone else, uncomment the line below
        'objMM.Bcc = "[e-mail]"
 
        'Send the email in text format
        objMM.BodyFormat = MailFormat.Text
        '(to send HTML format, change MailFormat.Text to MailFormat.Html)
 
        'Set the priority - options are High, Low, and Normal
        objMM.Priority = MailPriority.Normal
 
        'Set the subject
        objMM.Subject = "4GuysFromRolla.com - Feedback"
 
        'Set the body
        objMM.Body = "At " + DateTime.Now + " feedback was sent from an ASP.NET " & _
                     "Web page.  Below you will find the feedback message " & _
                     "send by " & txtName.Text & "." & vbCrLf & vbCrLf & _
                     "---------------------------------------" & vbCrLf & vbCrLf & _
                     txtMessage.Text & vbCrLf
 
 
        'Specify to use the default Smtp Server
        SmtpMail.SmtpServer = "smtp.gmail.com"
 
        'Now, to send the message, use the Send method of the SmtpMail class
        SmtpMail.Send(objMM)
 
 
        panelSendEmail.Visible = False
        panelMailSent.Visible = True
    End Sub
 
 
</script>
 
</asp:Content>
 
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<div class="contactback"><div class="contactdetailstext"><span style="font-family:Verdana;">Contact Details:</span></div><div class="contactdetailstext2"><span style=" font-weight:bold;">Address:</span><br />44 st mellion crescent<br />wrexham<br />ll13 9gz<br /><br /><span style="font-weight:bold;">Mobile:</span> 07824322300<br /><br /><span style="font-weight:bold;">Email Address:</span><br /><a href="mailto:[e-mail]?subject=website"> [e-mail]</a><br /><br /><span style="font-weight:bold;"><a href="">Facebook</a><br /><a href="">Twitter</a></span></div></div>
<asp:panel id="panelSendEmail" runat="server">
    <form id="Form1" runat="server">
      <h2>We are interested in your feedback!  Please enter the following
      requested information below to send us your comments.</h2>
 
      <b>Your Name:</b>
      <asp:textbox id="txtName" runat="server" />
      <br>
 
      <b>Your Email Address:</b>
      <asp:textbox id="txtEmail" runat="server" />
      <p>
 
      <b>Your Message:</b><br>
      <asp:textbox id="txtMessage" TextMode="MultiLine"
                      Columns="40" Rows="10" runat="server" />
      <p>
 
      <asp:button runat="server" id="btnSendFeedback" Text="Send Feedback!"
                  OnClick="btnSendFeedback_Click" />
    </form>
  </asp:panel>
 
 
  <asp:panel id="panelMailSent" Visible="False" runat="server">
    An email has been sent to the email address you specified.  Thanks!
  </asp:panel>
</asp:Content>

please help me to solve this problem as soon as possible

thanks in advance :)