title: error: cannot open .git/FETCH_HEAD: Invalid argument
body: <p>I'm using Git (from the GitHub for Windows distro) and trying to pull from my repo and I get the following error:</p>
  
  <pre><code>D:\Code\dopey-weaver [master]&gt; git fetch
  error: cannot open .git/FETCH_HEAD: Invalid argument
  
  D:\Code\dopey-weaver [master]&gt; git fetch --verbose
  error: cannot open .git/FETCH_HEAD: Invalid argument
  </code></pre>
  
  <p>This isn't the "Permission denied" of many other questions, so it seems like I'm a special snowflake...  I can open <code>.git/FETCH_HEAD</code> and it looks fine(?):</p>
  
  <pre><code>010779f14f5bdf1d2d806a0ce0ac4c5e50314186        branch 'master' of https://github.com/nicktimko/dopey-weaver
  </code></pre>
  
  <p>I think I have some conflict with what's on the remote so I should be pulling/merging, but I can't even fetch to start... The error message on push does look a little long (is this the equivalent of <code>hg</code> saying "this would create multiple heads" in not so many words?)</p>
  
  <pre><code>D:\Code\dopey-weaver [master]&gt; git push
  To https://github.com/nicktimko/dopey-weaver.git
   ! [rejected]        master -&gt; master (fetch first)
  error: failed to push some refs to 'https://github.com/nicktimko/dopey-weaver.git'
  hint: Updates were rejected because the remote contains work that you do
  hint: not have locally. This is usually caused by another repository pushing
  hint: to the same ref. You may want to first integrate the remote changes
  hint: (e.g., 'git pull ...') before pushing again.
  hint: See the 'Note about fast-forwards' in 'git push --help' for details.
  </code></pre>