Suddenly Getting The EntityFramework package is not installed on project ''. - ASP.NET MVC

Hey everyone,

I am working on a small project done in ASP.NET MVC4 and started getting the following error:

The EntityFramework package is not installed on project ”.

Get-Package : Cannot validate argument on parameter ‘ProjectName’. The argument is null or empty. Supply an argument that is not null or empty and then try the command again.
At C:SitesLearnerLessonspackagesEntityFramework.5.0.0toolsEntityFramework.psm1:611 char:40
+ $package = Get-Package -ProjectName <<<< $project.FullName | ?{ $_.Id -eq ‘EntityFramework’ }
+ CategoryInfo : InvalidData: (:) [Get-Package], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationError,NuGet.PowerShell.Commands.GetPackageCommand

The confusing thing was that I’d used it no more than an hour ago. The following StackOverflow post reveals the issue (and the fact that I should’ve read the error more carefully):

http://stackoverflow.com/a/14708897/522859

All I needed to do was select the correct project from the “Default Project” dropdown in the Package Manager Console:

The EntityFramework package is not installed on project ”