Every reference in Visual Studio Project is showing as invalid

Question

I have a very strange issue where I have opened a known to be working Visual Studio 2010 project but it no longer builds and every reference is shown as not being valid as shown in the screenshot below.

I have no idea why or what to do.

I have installed Visual Studio 2013 Express so I'm not sure if this may have screwed up something somewhere, but as a test the project is open in 2010 and I'm seeing this issue.

In the error tab of VS it shows the following error:

Error 1 This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105 . The missing file is ....\\ServerAdministrator\\packages\\System.Data.SQLite.Core.1.0.94.0\\build\\net40\\System.Data.SQLite.Core.targets. C:\\Users\\Chris\\Documents\\Visual Studio 2013\\Projects\\BoardiesITSolutionsLib\\BoardiesITSolutions\\BoardiesITSolutions.csproj 131 5 BoardiesITSolutions

The ServerAdministrator program that its mentioning is a totally different project, I've tried removing the references to System.Data.SqliteCore and tried telling NuGet to re-add them but no joy.

The warnings are:

The Referenced component 'WindowsBase' could not be found The Referenced component `System.Xml.Linq' could not be found

All of the warnings are along the same lines as above for each references shown in the screenshot.

Answer 1

As requested, my comment as an answer:

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If you look at the .csproj project file in a text editor (it's really just XML), do the references make sense?

Do you have that version of the .NET framework installed?

Typically the raw project file will give you a more detailed idea of what's going on than the IDE will.