Recently moved a web project to a new server and got the following error:

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: Data at the root level is invalid. Line 1, position 1.

Source Error:

Line 1:  <browsers>
Line 2:  	<browser refID="Default">
Line 3:  		<controlAdapters>

Source File: /App_Browsers/CSSFriendlyAdapters.browser    Line: 1

I panick a little bit everytime I see this error because it only comes up once in a blue moon and i never remember what I did the last time to fix it and searching online turns up only that it has something to do with FrontPage Server Extensions. Fear not. Server Extensions are not the devil as some would have you believe; even though they are at the heart of what is causing this problem.

In your App_Browsers directory FPSE has created a directory: _vti_cnf. Simply delete _vti_cnf in this directory and Voila! Problem solved and you're welcome.

Code on!,
Martin Welch