Hi Bob,
There might be some assemblies still referenced in you solution that are targeting the System.Windows.dll assembly by themselves and thus, producing this error to be thrown. Please check all the references of your solution to ensure that there is not other Silverlight library (or Blend library for Silverlight) referenced.
Regards,
Damian Cherubini
http://blogs.southworks.net/dcherubini
There might be some assemblies still referenced in you solution that are targeting the System.Windows.dll assembly by themselves and thus, producing this error to be thrown. Please check all the references of your solution to ensure that there is not other Silverlight library (or Blend library for Silverlight) referenced.
Regards,
Damian Cherubini
http://blogs.southworks.net/dcherubini