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Problem in solving this Error"Object reference not set to an instance of an object."

I have One User Panel Which has various functions....But when I click on change Password option I get the following error

And My User Panel is:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="User_Panel.aspx.cs" Inherits="housing1.User_Panel" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">

        .auto-style1 {
            text-align: center;
        }
        .auto-style2 {
            font-size: x-large;
            font-weight: bold;
            text-decoration: underline;
        }
        .auto-style3 {
            font-size: x-large;
            font-weight: bold;
        }
    </style>
</head>
<body style="background-color: #CCFFFF">
    <form id="form2" runat="server">
         <div class="auto-style1">
             <span class="auto-style2">User Panel</span><br class="auto-style3" />
             <br />
             <br />
             </div>
    <div style="text-align: center">
   
        <asp:LinkButton ID="LinkButton1" runat="server" BackColor="#FFCC99" BorderColor="Black" BorderStyle="Double" CausesValidation="False" Height="30px" PostBackUrl="~/Users/add_fmember.aspx" Width="152px">Add Family Details</asp:LinkButton>
        <br />
        <br />
        <asp:LinkButton ID="LinkButton2" runat="server" BackColor="#FFCC99" BorderColor="Black" BorderStyle="Double" CausesValidation="False" Height="30px" PostBackUrl="~/Users/edit_member.aspx" Width="152px">Update Details</asp:LinkButton>
        <br />
        <br />
        <asp:LinkButton ID="LinkButton3" runat="server" BackColor="#FFCC99" BorderColor="Black" BorderStyle="Double" CausesValidation="False" Height="30px" PostBackUrl="~/Users/Ucomplain.aspx" Width="152px">Generate Complain</asp:LinkButton>
        <br />
        <br />
        <asp:LinkButton ID="LinkButton6" runat="server" BackColor="#FFCC99" BorderColor="Black" BorderStyle="Double" CausesValidation="False" Height="30px" PostBackUrl="~/Users/My_Complain.aspx" Width="152px">Update Complains</asp:LinkButton>
        <br />
        <br />
        <asp:LinkButton ID="LinkButton4" runat="server" BackColor="#FFCC99" BorderColor="Black" BorderStyle="Double" CausesValidation="False" Height="39px" PostBackUrl="~/Users/Check_Status.aspx" Width="152px">Check Status</asp:LinkButton>
    
        <br />
        <br />
        <asp:LinkButton ID="LinkButton5" runat="server" BackColor="#FFCC99" BorderColor="Black" BorderStyle="Double" CausesValidation="False" Height="39px" Width="152px" OnClick="LinkButton5_Click">Change Password</asp:LinkButton>
    
    </div>
         <asp:HiddenField ID="HiddenFieldUN" runat="server" />
         <br />
         <p>
             &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:LoginStatus ID="LoginStatus1" runat="server" LogoutAction="Redirect" LogoutPageUrl="~/Index/Index.aspx" />
             &nbsp;</p>
    </form>
    
</body>
</html>

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The Page where the error appears is User_Panel.aspx , when I return back after performing some other functionality for ex I clicked update details and then I come back to user panel and click change password so i get this error mentioned above......
User_Panel.aspx.cs