I had been working on a solution that contained several projects. Due to company conventions I had to rename the projects, name spaces, and change the folder structure. Things seems to work, builds were good and the applications would run without error.
the problem occurred once I checked it all into TFS, and made everyone target the same framework. Some how I was getting an error about Entity Framework and that I needed to reinstall it.
I ran the command for each project and both times would receive a message like this one;
Skipped Reinstalling package ‘Name Here’ because the package does not exist in the package source.
My fix was simple. I went to the project and managed its packages. I noticed that Entity Framework was not even installed. I thought that kind of odd as I assumed the Update-Package -reinstall would have done it, but I clicked the install button.
Everyone is happy now.