Package is not found on source
<p>We're using a local Nuget feed structured as hierarchical folders.</p>

<p>I have this error from Nuget Package Manager 3.5.0.1737 under Visual Studio 2015 :</p>

<p><strong>\hd\teamshare\NugetsNew: Package 'Configuration.WebAPI.Client.1.0.16405.2-alpha' is not found on source '\hd\teamshare\NugetsNew'.</strong></p>

<pre><code>Severity    Code    Description Project File    Line    Suppression State
Error       NuGet Package restore failed for project Softs\FrontEnd\Web.FormHost: NuGet.Protocol.Core.Types.FatalProtocolException: Unable to find version '1.0.16405.2-alpha' of package 'Configuration.WebAPI.Client'.
  \\hd\teamshare\NugetsNew: Package 'Configuration.WebAPI.Client.1.0.16405.2-alpha' is not found on source '\\hd\teamshare\NugetsNew'.
  https://api.nuget.org/v3/index.json: Package 'Configuration.WebAPI.Client.1.0.16405.2-alpha' is not found on source 'https://api.nuget.org/v3/index.json'.

   at NuGet.PackageManagement.PackageDownloader.&lt;GetDownloadResourceResultAsync&gt;d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.PackageManagement.NuGetPackageManager.&lt;RestorePackageAsync&gt;d__68.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.PackageManagement.PackageRestoreManager.&lt;RestorePackageAsync&gt;d__39.MoveNext().          0   
</code></pre>

<p>As you can see, the package <strong>'Configuration.WebAPI.Client.1.0.16405.2-alpha'</strong> is not found.</p>

<p>This nuget has been published in the local feed and added in the designated project by one of my coworker.</p>

<p>This is the first time I have that kind of message. I upgraded to this specific version of Nuget Package Manager last week.</p>

<p>The nuget is present in the directory structure.</p>

<p><a href="https://i.stack.imgur.com/8M8uK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8M8uK.png" alt="enter image description here"></a></p>

<p>On interresting point is that Process Monitor show NO activity on this directory. It shows activity on other nuget folders though.</p>