NuGet unable to find the version of a package
<p>Running the command</p>
<pre><code>nuget.exe restore .\MySolution.sln
</code></pre>
<p>gives this error:</p>
<blockquote>
<p>Unable to find version '1.0.0' of package 'Microsoft.Net.Compilers'.</p>
</blockquote>
<p>where the package has previously been installed and restored, but it has somehow become corrupt.</p>