HTTP 500.19 -Internal Server Error

I'm running windows vista and I'm getting the message below. Any ideas on
this please?


Server Error in Application "Default Web Site"

--------------------------------------------------------------------------------

HTTP Error 500.19 - Internal Server Error
Description: The requested page cannot be accessed because the related
configuration data for the page is invalid.

Error Code: 0x800700b7

Notification: BeginRequest

Module: FailedRequestsTracingModule

Requested URL: http://localhost:80/mysampleapp/helloworld.htm

Physical Path: C:\inetpub\wwwroot\mysampleapp\helloworld.htm

Logon User: Not yet determined

Logon Method: Not yet determined

Failed Request Tracing Log Directory: C:\inetpub\logs\FailedReqLogFiles

Handler: StaticFile

Config Error: Cannot add duplicate collection entry

Config File: \\?\C:\Windows\system32\inetsrv\config\application Host.config

Config Source: 834: <traceFailedRequests>
835: <add path="*">
836: <traceAreas>




More Information... This error occurs when there is a problem reading the
configuration file for the Web server or Web application. In some cases, the
event logs may contain more information about what caused this error.


--------------------------------------------------------------------------------
Server Version Information: Internet Information Services 7.0.