I am trying im plement  a simpel calender extender in umbraco usercontrol

it gives me this error

Error creating control (usercontrols/AdmiralIssuesCreate.ascx).
Maybe file doesn't exists or the usercontrol has a cache directive, which is not allowed! See the tracestack for more information!

here is my  user control file:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="AdmiralIssuesCreate.ascx.cs" Inherits="WebUmbracoLogin.AdmiralIssuesCreate" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolKit" %>
<ajaxToolKit:ToolkitScriptManager ID="ToolkitScriptManager1" CombineScripts="false" runat="server">
</ajaxToolKit:ToolkitScriptManager>


    <p>

    </p>

    <ContentTemplate>
       
        <table class="style1">
            <tr>
                <td align="center" colspan="2">
   
      
                    <asp:Label ID="lblResult" runat="server" ForeColor="#CC0000"></asp:Label>
                </td>
            </tr>
            <tr>
                <td align="center" colspan="2">
                    <asp:ValidationSummary ID="ValidationSummary1" runat="server"
                ValidationGroup="t" />
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label1" runat="server" Text="Title"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtIssueName" runat="server" ValidationGroup="t" Width="369px"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
                ControlToValidate="txtIssueName" Display="None"
                ErrorMessage="Title Required" ValidationGroup="t"></asp:RequiredFieldValidator>
                </td>
            </tr>
            <tr>
                <td align="right" valign="top">
                    <asp:Label ID="Label2" runat="server" Text="CreatedDate"></asp:Label>
                </td>
                <td>
                   <asp:TextBox ID="txtCreatedDate" runat="server" ValidationGroup="t"
                Width="140px"></asp:TextBox>
                     <asp:Button ID="btnDate" runat="server" Height="22px" Text=".."
                        Width="27px" />
               <ajaxToolkit:CalendarExtender ID="CalendarExtender1" TargetControlID="txtCreatedDate" PopupButtonID="btnDate"  runat="server"></ajaxToolkit:CalendarExtender>
                     <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
                ControlToValidate="txtCreatedDate" Display="None"
                ErrorMessage="created date Required" ValidationGroup="t"></asp:RequiredFieldValidator>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label3" runat="server" Text="IssueCategory"></asp:Label>
                </td>
                <td>
                    <asp:DropDownList ID="DropIssueCategory" runat="server" Height="21px"
                        Width="188px">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td align="right" valign="top">
                    <asp:Label ID="Label4" runat="server" Text="IssueDescription"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtIssueDescription" runat="server" Height="71px"
                TextMode="MultiLine" ValidationGroup="t" Width="345px"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
                ControlToValidate="txtIssueDescription"
                ErrorMessage="Issue Description Required" ValidationGroup="t" BorderStyle="None"
                        Display="None"></asp:RequiredFieldValidator>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label8" runat="server" Text="Status"></asp:Label>
                </td>
                <td>
                    <asp:DropDownList ID="DropStatus" runat="server" Height="21px" Width="184px">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label5" runat="server" Text="ContactPerson"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtContactPerson" runat="server" ValidationGroup="t"
                        Width="315px"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
                        ControlToValidate="txtContactPerson" Display="None"
                        ErrorMessage="contact person required" ValidationGroup="t"></asp:RequiredFieldValidator>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label6" runat="server" Text="ContactTelephone"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtContactTelephone" runat="server" Width="310px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label7" runat="server" Text="ContactEmail"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtContactEmail" runat="server" Width="312px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label9" runat="server" Text="Issues Group "></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtIssuegroup" runat="server" Width="328px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" valign="top">
                    <asp:Label ID="Label10" runat="server" Text="Solution"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtSolution" runat="server" Height="66px" Width="449px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" valign="top">
                    <asp:Label ID="Label12" runat="server" Text="Priority"></asp:Label>
                </td>
                <td>
                    <asp:DropDownList ID="DropPriority" runat="server" Height="38px" Width="200px">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td align="right">
                    <asp:Label ID="Label11" runat="server" Text="Responsible Person"></asp:Label>
                </td>
                <td valign="baseline">
                    <asp:TextBox ID="txtRespPerson" runat="server" Width="389px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right">
                    &nbsp;</td>
                <td>
                    <asp:Button ID="btnSubmit" runat="server" onclick="btnSubmit_Click"
                Text="Submit" ValidationGroup="t" Width="127px" />
                </td>
            </tr>
            <tr>
                <td align="right">
                    &nbsp;</td>
                <td>
                    &nbsp;</td>
            </tr>
        </table>
    </ContentTemplate>

any ideas or suggestion is welcome

using ajaxcontroltoolkit 3.5 with umrbaco 4.7