Исправьте проблему главной страницы в C# visual studio

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Это моя домашняя страница. Это дает мне ошибку "эта страница содержит код, который не является допустимым при подключении к главной странице" Я не знаю, почему?

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Poonam1._Default" %>
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
    <div class="jumbotron">
        <h1>POONAM1</h1>
        <p class="MsoNormal">
            <span>A paradigm & revolution in ecommerce </span></p>
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        </p>
        <p class="MsoNormal">
        <span><span style="font-size: medium">This page will redirect you to</span> <span style="font-size: medium">the demo portal of Jileva (hypothetical name) where you, the user can in a simulated manner, feel and experience the process and workflow of the Poonam Application. This will be a hands on experience, but remember this is only a simulation, and the actual experience will be much more interesting, but, at the same time much more intense. Once you read through this page, there is a link to the demo page, at the bottom of this page.</span></span></p>
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        </p>
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        </p>
        <p class="lead"> </p>
        </div>
        <div class="row">
        <div class="col-md-4">
        <h2>Getting started</h2>
        <p> </p>
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                <span>Before you visit the demo, there are certain concepts that you must be aware of. And they are:                                               
</span>
            </p>
            <ul>
                <li>
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                        <![if !supportLists]><span>Familiarity with the new concept of parallel shopping as explained on this website.</span></p>
                </li>
                <li>
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                        <span>Knowledge of ecommerce basics and online shopping portals.</span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <![if !supportLists]><span>Understanding the terms JCOP and JCPP and how they uniquely benefit the user.<o:p></o:p></span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <![if !supportLists]><![endif]><span>Understand during the demo the difference between other price aggregator sites and us.<o:p></o:p></span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <o:p>
                        There is no user name/password feature</p>
                </li>
            </ul>
            <p>
                 </p>
            <p>
                 <a class="btn btn-default" href="http://go.microsoft.com/fwlink/?LinkId=301949">See Home Page »</a></p>
            <p>
                 </p>
        </div>
        <div class="col-md-4">
            <h2>Know More</h2>
            <p>
                 </p>
            <ul>
                <li>
                    <p class="MsoNormal">
                        <span>This is a Proof of Concept (POC) and not an actual live transaction.</span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <span>The vendors and their products displayed here are based on the vendors' participation.</span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <span>There will be only one order and not separate orders of each vendors. That is the core.</span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <span>There will be only only combined shipment for every individual order.</span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <span>It is not mandatory to select a second product from a separate vendor if you want just one product.</span></p>
                </li>
                <li>
                    <p class="MsoNormal">
                        <span>No actual payment is to be done in this POC, it is just a simulation</span></p>
                </li>
                <li><span>It is appreciated if you can give us your feedback, comments and suggestions in our Contact Us page. </span></li>
            </ul>
            <p>
 </p>
            <p>
                <a class="btn btn-default" href="http://go.microsoft.com/fwlink/?LinkId=301949">See Use Cases »</a>
            </p>
            <p>
                 </p>
            <p>
                 </p>
            <p>
                 </p>
            <p>
                <a href="~/demoa1.aspx" class="btn btn-primary btn-lg">Visit Demo Page »</a></p>
        </div>
        <div class="col-md-4">
            <h2>The Jileva Process </h2>
            <p>
                You can easily find your way around this demo with the right mix of features and price.
            </p>
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                <span>Be familiar with the entire lifecycle of the Jileva platform before you enter the demo/ POC. Here are some things to remember:</span></p>
            <p class="MsoNormal">
                <![if !supportLists]><span>You can select multiple products from more than one vendor. </span>
            </p>
            <p class="MsoNormal">
                <![if !supportLists]><![endif]><span>No matter how many vendors you engage, there will be only one order. That is our USP.</span></p>
            <p class="MsoNormal">
                <![if !supportLists]><![endif]><span>Also there will be one combined, synchronous shipment for your products. That is JCPP.</span></p>
            <p>
                 </p>
            <p>
                <a class="btn btn-default" href="http://go.microsoft.com/fwlink/?LinkId=301950">Process Page »</a>
            </p>
        </div>
    </div>

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Что я уже пробовал:

Он не открывает для меня представление конструктора, но и не дает мне ошибок сборки

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