title: NuGet Package restore failed: Microsoft.Bcl.Build.Tasks.dll used by another process
body: <blockquote>
    <p>NuGet Package restore failed for project MyProject.Application: The
    process cannot access the file
    'C:\MySolution\packages\Microsoft.Bcl.Build.1.0.21\build/Microsoft.Bcl.Build.Tasks.dll'
    because it is being used by another process..</p>
  </blockquote>
  
  <p>Any idea how to fix this issue? Thanks.</p>