I have already installed VS2017 Enterprise 15.6.4
. Recently installed .NET Core 2.1.101 SDK
from official site
I was expecting .NET Core
Make sure that Visual Studio 2017 is up to date. Go to "Tools" -> "Extensions and Updates" to install visual studio updates. This resolved the issue for me.
Updated to Latest VS 2017 and installed latest .Net Core SDK. Changed global.json to point to latest version installed. This resolved for me.