title: Go To Definition: "Cannot navigate to the symbol under the caret."
body: <p>I suddenly started experiencing a problem today in my project where clicking Go To Definition gives me a strange error: "Cannot navigate to the symbol under the caret."</p>
  
  <p><a href="https://i.stack.imgur.com/lq4TY.png"><img src="https://i.stack.imgur.com/lq4TY.png" alt="enter image description here"></a></p>
  
  <p>I first noticed it some time after installing <a href="https://github.com/Fody/Costura">Costura.Fody</a> via NuGet. I've since uninstalled it but the problem persists. I've cleaned and rebuilt the solution multiple times. There are no instances of "Fody" or "Costura" anywhere in my git commit history, before or after the point in time when this started happening, so I'm thinking that one of my .gitignore'd files is stuck in a bad state.</p>
  
  <p>The problem only occurs if the definition being targeted is in another file; Go To Definition for something in the currently opened file works fine. Peek Definition works fine too. Other solutions/projects work fine as well -- it's only this one that's causing issues.</p>
  
  <p>I'm using Visual Studio 2015. The issue doesn't seem to occur in the 2013 version.</p>
  
  <p>Why does this error occur and how can I fix it?</p>