I have already installed VS2017 Enterprise 15.6.4. Recently installed .NET Core 2.1.101 SDK from official site
VS2017 Enterprise 15.6.4
.NET Core 2.1.101 SDK
I was expecting .NET Core
.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.