every time I save in vs.net it adds inherits="nsite._default" to the top line. and it causes an error. what can i do?

Code:
Server Error in '/nsite' Application.
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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 'nsite._default'.

Source Error: 


Line 1:  <%@ Page Language="vb" AutoEventWireup="false" Codebehind="default.aspx.vb" Inherits="nsite._default" %>
Line 2:  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
Line 3:  <HTML>
 

Source File: D:\temp\iis_outside_empty\nsite\ex\html\nw\default.aspx    Line: 1 


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Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573