Debugger already attached error in Visual WebDeveloper

I am using Visual WebDeveloper 2005 Express Edition for asp.net and i have given response.redirect to a page in the linkbutton click event.

A error occurs when i click the link button

Unable to attach to application 'WebDev.WebServer.EXE' (PID: 2180) using 'comp26'.

A debugger is already attached.

Do you want to continue anyway

The error occurs as above.

The page directive is:

<%@ Page Language="C#" Debug = "true" AutoEventWireup="true" CodeFile="TopUpCardForm.aspx.cs" Inherits="TopUpCardForm" %>

How to solve the problem

Willfin David.