Unable to create/open C++ project in Visual Studio 2015 Community RTM

Question

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:

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)'.

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?

Answer 1

Check if the Microsoft.VisualStudio.ProjectSystem.v14only.dll assembly is in your GAC (you'll see a similarly-named folder under C:\\Windows\\Microsoft.NET\\assembly\\GAC_MSIL if it is). It shouldn't be there. But perhaps you have an old version of that assembly in your GAC. If you see any folders in your GAC starting with Microsoft.VisualStudio.ProjectSystem.* , move them to a temporary folder and see if it fixes your problem. If it does, delete your temporary folder.