The 'ParadoxPackage' package did not load correctly

I got everything installed and was able to run the samples but when I try to open Visual Studio I get an error The ‘ParadoxPackage’ package did not load correctly. The problem may have been caused by a configuration change or by the installation of another extension. You can get more information by examining the file ‘ActivityLog.xml’.

I found the following in several spots in the file:

647 2015/01/05 00:41:27.260 Error VisualStudio SetSite failed for package [ParadoxPackage] {C26B1CE9-BBAB-497B-98AD-67E93A2037D1}
80070002 Could not load file or assembly 'Microsoft.VisualStudio.Package.LanguageService.11.0, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. 648 2015/01/05 00:41:27.260 Error VisualStudio End package load [ParadoxPackage] {C26B1CE9-BBAB-497B-98AD-67E93A2037D1}
80070002 Could not load file or assembly 'Microsoft.VisualStudio.Package.LanguageService.11.0, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

Which OS version and VS (with which update) do you have installed and working with?

Windows 8.1 and Visual Studio Ultimate 2013 version 12.0.31101.00 Update 4