The razortaghelper task failed unexpectedly

 After updating Visual studio to New version, I suddenly started getting error 

the razortaghelper task failed unexpectedly

Well after doing some research on Internet I came across following solutions

Added the following environment variable to my user environment to make it build again:
DOTNET_HOST_PATH

%ProgramFiles%\dotnet\dotnet.exe 

Simply go to Environment Variable, check following images

 

After clicking on Environment Variables, click on New, Pop up will open up, simply add entries as per following image and click Ok

Now when you build The razortaghelper task failed unexpectedly error will go away.