title: Unable to create/open C++ project in Visual Studio 2015 Community RTM
body: <p>Before installation of RTM version of VS2015 Community Edition I had uninstalled VS2015 Enterprise CTP6 (including applications from "second installer"). There wasn't any problem during installation, but now I'm unable to create/open any C++ project. I receive following error message:</p>
  
  <p>C:\Users\Piotrek\Documents\Visual Studio 14\Projects\Tests\Tests\Tests.vcxproj : error  : Method not found: 'System.Threading.Tasks.Task Microsoft.VisualStudio.Project.IVsUnconfiguredProjectTypeGuidSetter.SetActiveProjectConfigurationAsync(Microsoft.VisualStudio.ProjectSystem.ProjectConfiguration, Microsoft.VisualStudio.ProjectSystem.ProjectConfiguration)'.</p>
  
  <p>I tried to reinstall all related to any VS version stuff, but the problem remains.
  Unfortunately, Google knows nothing about SetActiveProjectConfigurationAsync and now I'm stuck. Any suggestions?</p>