You may experience the following error when you attempt to open your web
application:
Description: An error occurred during the processing of a
configuration file required to service this request. Please review the
specific error details below and modify your configuration file
appropriately.
Parser Error Message: Unrecognized attribute 'targetFramework'.
Note that attribute names are case-sensitive.
The error indicates that your account is configured to run with the
ASP.NET 2.0 framework, but your application is an ASP.NET 4.0
application.
To resolve the problem simply click the
ASP.NET Version icon in the
Site Tools section of Control Panel to switch the framework to 4.0.
See this Knowledge Base article for more information.
Article ID: 816, Created On: 5/13/2010, Modified: 4/21/2011