vscode-csharp: Intellisense no longer working on C# files

Environment data

dotnet --info output:

.NET Command Line Tools (2.0.0)

Product Information:
 Version:            2.0.0
 Commit SHA-1 hash:  cdcd1928c9

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.15063
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.0.0\

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.0
  Build    : e8b8861ac7faf042c87a5c2f9f2d04c98b69f28d

VS Code version: 1.16.1 64 bit

C# Extension version: 1.12.1

Steps to reproduce

I open a C# file and try to get intellisense. It did not working in the 32 bit version and I just now installed 64 bit. I uninstalled and reinstalled C# extension but cannot get any intellisense working in C#.

Expected behavior

Intelliense

Actual behavior

No intellisense in C#

Thanks