The 'Visual Studio Explorers and Designer Package' package did not load correctly

Every time I open solution in Visual Studio 2015 I get following message:

Here are last entries from ActivityLog.xml:

<entry><record>827</record><time>2015/12/23 11:26:13.919</time><type>Error</type><source>VisualStudio</source><description>SetSite failed for package [Visual Studio Explorers and Designers Package][Object reference not set to an instance of an object.]:{   at Microsoft.VSDesigner.VSDMenus.Initialize(IServiceProvider serviceProvider)&#x000D;&#x000A;   at Microsoft.VSDesigner.VSDesignerPackage.VSDesignerPackage.Initialize()&#x000D;&#x000A;   at Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.Interop.IVsPackage.SetSite(IServiceProvider sp)}</description><guid>{8D8529D3-625D-4496-8354-3DAD630ECC1B}</guid><hr>80004003 - E_POINTER</hr><errorinfo>Object reference not set to an instance of an object.</errorinfo></entry>

I followed suggestions found in a similar question but with no success.

Unfortunately re-installing NuGet via Extensions and Updates doesn't solve the issue.