Button inside update panel causing error

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VB

buttons

UpdatePanel

Hye all,

Here is my scenario:
- When user click on a button (Change Section button), it causes another button (Submit button) to appear. I need to put the submit button inside updatepanel otherwise the button wud not be displayed when user click change section.
- Now the submit button appears, but when i click submit, this error occurs:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

I have tried change causevalidation to false and add

<Triggers>
           <asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
       </Triggers>

in update panel properties but neither works. Any other idea how to solve this?

<asp:UpdatePanel ID="UpdatePanel2" runat="server">
   <ContentTemplate>


                 <div id="divSubmit" runat = "server" visible ="false">

                                  <table runat="server" id="tableSubmit" style="width: 53%">
                                      <tr>
                                          <td style="width: 114px">
                                              Select manager</td>
                                          <td style="width: 8px">
                                              :</td>
                                          <td style="width: 183px">
                                              <asp:DropDownList ID="ddlMgr" runat="server" CssClass="txtbox">
                                              </asp:DropDownList>
                                              <asp:Label ID="lblddlMgr" runat="server" Font-Size="11pt"
                                                  Text="Change Resp. Section does not require Manager's Approval" Visible="False"></asp:Label>
                                          </td>
                                      </tr>
                                      <tr>
                                          <td colspan="3">
                                              &nbsp;</td>
                                      </tr>
                                  </table>
                                  <asp:UpdateProgress ID="UpdateProgress4" runat="server" DynamicLayout="False">
                                      <ProgressTemplate>
                                          <div align="center" style="font-weight:bold">
                                              &nbsp;<asp:Image ID="aspImg4" runat="server" Height="16px"
                                                  ImageUrl="~/img/loading_bar.gif" Width="177px" />
                                              Submitting...</div>
                                      </ProgressTemplate>
                                  </asp:UpdateProgress>
                                  <asp:Button ID="btnSubmit" runat="server" CssClass="button" Height="42px"
                                      Text="Resubmit" Width="202px" CausesValidation="False" />
                                  <br />

                 </div>
</ContentTemplate>
       <Triggers>
           <asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
       </Triggers>
   </asp:UpdatePanel>