Assembly: PresentationFramework (in PresentationFramework.dll)
The WebBrowser instance is no longer valid.
A reference to the underlying native WebBrowser could not be retrieved.
Navigation from an application that is running in partial trust to a Uri that is not located at the site of origin.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.