I have a WCF Data Service project built with Visual Studio 2010, which was working fine. All of a sudden, it didn’t compile anymore. It was giving me messages like:
Error 7 The type or namespace name ‘Services’ does not exist in the namespace ‘System.Data’ (are you missing an assembly reference?) C:\U…s\Visual Studio 2010\Projects…\DataService.cs …
Error 8 The type or namespace name ‘Linq’ does not exist in the namespace ‘System’ (are you missing an assembly reference?) DependencyResolver.cs 3 14
Error 10 The type or namespace name ‘Web’ does not exist in the namespace ‘System.ServiceModel’ (are you missing an assembly reference?)
Error 12 The type or namespace name ‘DataService’ could not be found (are you missing a using directive or an assembly reference?)
How can I fix it?