This is the problem.
Can't install Package Facebook. Anyone?
When I search at console, "Install-Package Facebook".
This problem appear :
Install-Package : The current environment doesn't have a solution open.At line:1 char:1
+ Install-Package Facebook
+ ~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetNoActiveSolution,NuGet.PowerShell.Commands.InstallPackageCommand