title: Visual Studio is opening with multiple solutions when I only want one
body: <p>I am making a Unity project using visual studio, and anytime I open up VS via opening a script in Unity, the VS project connected opens multiple solutions and a warning window pops up saying: <a href="https://i.stack.imgur.com/F3HA5.png" rel="nofollow noreferrer">disc of error</a></p>
  
  <p>This error does not keep me from using VS, but I think it is interfering with Intellisense, as I am only able to autocomplete some data. Also, I believe references from any "using" namespaces other than the 3 that automatically appear on scripts, show up as errors.</p>