title: An error occurred while retrieving package metadata for 'Microsoft.CSharp.4.3.0'
body: <p>All,</p>
  
  <p>I have just updated the .Net framework to 4.5 and re-installed Microsoft.CSharp (as it was showing a yellow icon next to it under my reference folder).</p>
  
  <p>Now every time I try to install or update <strong>ANY</strong> package from Nuget, I get the following error in red:</p>
  
  <p>An error occurred while retrieving package metadata for 'Microsoft.CSharp.4.3.0'</p>
  
  <p>I also tried to update the Nuget Package Sources to the following at different time but to no avail:
  <a href="https://www.nuget.org/api/v2/" rel="nofollow noreferrer">https://www.nuget.org/api/v2/</a>
  <a href="http://packages.nuget.org/v1/FeedService.svc" rel="nofollow noreferrer">http://packages.nuget.org/v1/FeedService.svc</a> </p>
  
  <p>Can anyone shed some light on the above?</p>