Could not load file or assembly 'System.Configuration.ConfigurationManager,

Why might I getting this error. I am trying to connect to a DB from a console application and get this error.
FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

Imports System.Data.Entity

Module Program

    Dim people As IEnumerable(Of Person) = New List(Of Person)

    Sub Main(ByVal args As String())
        Using context = New EFDbContext() '<--- Error here
            Dim repo As ITestRepository = New EFRepository(Of EFDbContext)(context)

        End Using

    End Sub
End Module

Public Class EFDbContext
    Inherits DbContext

        Public Sub New()
            MyBase.New("name=EFDbContext")
        End Sub

    Public Property People As DbSet(Of Person)

End Class

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