Error: The type or namespace name 'UserRegistrationContext' could not be found (are you missing a using directive or an assembly reference?)

Error:  The type or namespace name 'UserRegistrationContext' could not be found (are you missing a using directive or an assembly reference?) OR Error:  Views\Login\RegistrationForm.xaml.cs (133): The type or namespace name 'CreateUserStatus' could not be found (are you missing a using directive or an assembly reference?) I got this error when I was trying to build Silverlight 4.0 project using by TFS 2010 MSBuild, I got this error when I was trying to build "Silverlight" Project then "Silverlight. Web" I solved this error by changing the order of the project file into MSBuild items, now first build "Silverlight. Web" then "Silverlight" project Build will be succeeded without any error