VS2010 Compilation failed. Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

I have upgraded my sharepoint VS2008 workflow VS2008 project to VS2010 and When I did the build I got this error

"Compilation failed. Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. "

To resolve it

Go to assembly file and remove this attribute and do a build should work
[assembly: SecurityTransparent()]