title: Error: "The file '/MasterPages/MainMaster.master' does not exist." (Yes, this file does exist!)
body: <p>I just got a new desktop computer with Windows 7 Pro as the operating system. I installed Visual Studio 2008 on to this new computer and tried to open a previously existing ASP.NET 3.5 solution that displayed perfectly fine on my previous computer (this previous computer used the Windows XP operating system, IIS6, and IE7 browser). However, in Windows7/IE8, I’m receiving the following error:</p>
  
  <blockquote>
    <p>Server Error in '/' Application. </p>
    
    <hr>
    
    <p>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.</p>
    
    <p>Parser Error Message: The file
    '/MasterPages/MainMaster.master' does not exist.</p>
    
    <p>Source Error: </p>
    
    <p>Line 1:  &lt;%@ Page Language="C#"
    AutoEventWireup="true" 
    CodeFile="default.aspx.cs"
    Inherits="_Default"
    MasterPageFile="~/MasterPages/MainMaster.master"%> 
    Line 2:<br>
    Line 3:  &lt;%@ Register TagPrefix="SBLContent" TagName="SBLContentBlock" 
    Src="usercontrols/content.ascx"%></p>
    
    <p>Source File: /SBLWebSite/default.aspx 
    Line: 1 </p>
    
    <hr>
    
    <p>Version Information: Microsoft .NET
    Framework Version:2.0.50727.4952;
    ASP.NET Version:2.0.50727.4927</p>
  </blockquote>
  
  <p>Please believe me when I tell you that the file ‘/MasterPages/MainMaster.master’ file does, in fact, exist. </p>
  
  <p>In addition, this file’s location is properly referenced in the code (as indicated in Line 1 above), and as I said, was displayed properly by the browser in my previous computer.  It might also be helpful to note that I’ve tried to navigate to other pages in this site, and this browser displays the same message for any and all master pages located in my MasterPages folder. </p>
  
  <p>In summary, for some reason the browser cannot see any pages in the MasterPages folder. Can anybody tell me why I’m getting this error message when the folder and file is exactly where default.aspx says it is? </p>
  
  <p>Thanks in advance!</p>