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

If you've recently upgraded FIM to RTM and you're getting the following error message when you compile your custom activities, then you probably need to copy the new Microsoft.IdentityManagement libraries out of the GAC.

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

copy /y C:\Windows\assembly\GAC_MSIL\Microsoft.IdentityManagement.WFExtensionInterfaces\4.0.2592.0__31bf3856ad364e35\Microsoft.IdentityManagement.WFExtensionInterfaces.dll .

copy /y C:\Windows\assembly\GAC_MSIL\Microsoft.IdentityManagement.Activities\4.0.2592.0__31bf3856ad364e35\Microsoft.IdentityManagement.Activities.dll .

copy /y C:\Windows\assembly\GAC_MSIL\Microsoft.IdentityManagement.WebUI.Controls\4.0.2592.0__31bf3856ad364e35\Microsoft.IdentityManagement.WebUI.Controls.dll .