Visual Studio 2010 - Error When Running Asp 4 Application

I am getting this error, and cant figure out what the issue is.

Server Error in '/' Application.

Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: 'JobManager.Contact' is not allowed here because it does not extend class 'System.Web.UI.Page'.

Source Error:
Line 1: <%@ Page Title="Contact" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
Line 2: CodeBehind="Contact.aspx.cs" Inherits="JobManager.Contact" %>
Line 3:

Source File: /Contact.aspx Line: 1
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

The code behind syntax is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace JobManager
{
public partial class Contact : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
}