I have a web project in my solution file that is \"unavailable\" when I open the solution. When I right-click on the web project and reload the project, I get the following
I ran into this issue when the element in the .csproj file contained the unit test project GUID: {3AC096D0-A1C2-E12C-1390-A8335801FDAB}.
{3AC096D0-A1C2-E12C-1390-A8335801FDAB}
Removing it made the project load without problems.