Lost shared code reference in Universal Apps

Question

Anyone know why when I reopened Visual Studio my reference to the shared project is no longer referenced and when I try to add the reference back manually I can't do it. I did not remove the shared project to begin with.

I only have SignalR as referenced if that'll make any difference.

Update

Here's the link if anyone is interested for the Visual Studio logs

Answer 1

I ended up creating a new Universal apps and compare the .csproj. I edited the existing .csproj and added this back. It worked but still doesn't explain why it disappeared.

<Import Project="..\UBelt.WindowsUniversal.Shared\UBelt.WindowsUniversal.Shared.projitems" Label="Shared" />