You get this error when attempting to run your application:
Configuration 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: The base class includes the field ‘XXX’, but its type (‘YYY’) is not compatible with the type of control (‘ZZZ’).
You are running a different version of the .NET Framework than the one for which your application was created.
Configure the Microsoft IIS server to use .NET Framework 2.0 or later and the application should then run properly. See these topics for instructions:
Microsoft IIS is Not Installed on Your Machine
Microsoft IIS is Stopped (Not Running)
Running Microsoft IIS 6.0 on Windows Server 2003
Part VII: Troubleshooting Applications
Application Runs But No Data is Displayed