server error in '/' application

The resource cannot be found.

Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly.

Requested URL: /GenericErrorPage.htm

I try to check back my source code but nothg wrong with my code. Besides that, after i close the window, a pop up message will keep on show on screen. The title of the pop up screen is "Microfour Strataframe Extensibility". It very annonying. Why it will happen? How to solve it?Thank.