ASP.NET Parser Error: How to Diagnose

My hosting service just migrated my web site and my ASP.NET web application to a new server, and now when I go to the application, I get the following error message. I'm not really an ASP.NET expert, so my question is how do I figure out why I'm getting this message and maybe what can I do to fix it. Any help would be greatly appreciated. The message is:

Server Error in '/Interactive' 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: Could not load type 'KJI.IF.main'.

Source Error:

Line 1:  <%@ Page language="c#" Codebehind="main.aspx.cs" trace="false" AutoEventWireup="false" Inherits="KJI.IF.main" %>
Line 2:  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > 
Line 3:  

Source File: \\boswinfs04\home\users\web\b2447\whl.tjgquicken\Interactive\main.aspx    Line: 1

Version Information: Microsoft .NET Framework Version:1.1.4322.2407; ASP.NET Version:1.1.4322.2407

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so you did not change anything in your code correct ? The error says..your website is under .NET 1.1 you sure it was previously running under that version of that changed while moving?
tjgquickenAuthor Commented:
That is correct, it is an old application running under .NET 1.1 (I was afraid I'd break something if I tried to upgrade) and I didn't change anything in the code when they switched servers.
Did the assembly referred KJI.IF.main is moved elsewhere? Make sure that is available in bin folder of the application root. Also, it is possible that the assembly was installed in GAC in the earlier case and not there in GAC after migration.

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