HTTP Error 500.19 - Internal Server Error

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information

Module	IIS Web Core
Notification	BeginRequest
Handler	Not yet determined
Error Code	0x800700b7
Config Error	There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined
Config File	\\?\C:\Temp\test2\web.config

Requested URL	http://localhost:80/mvc2
Physical Path	C:\Temp\test2
Logon Method	Not yet determined
Logon User	Not yet determined

Fix:

If your plan is to deploy to an IIS that has an Application Pool running in .net 4.0 you will need to cleanup the web.config that includes all the section Definitions that point to .net 3.5. The reason this fails is because these section definitions are already included in the root web.config in .NET 4.0 (see %windir%\microsoft.net\framework\v4.0.30319\config\machine.config) that include all the system.web.extensions declared already.

Another quick fix is to have the application pool set to 2.0 just as your development machine appears to have. 

Delete or comment out all the system.web.extensions configuration section definitions and configuration section group definitions from the application-level