I tried internet search on this issue and it is very common with many suggestions. The problem started with an update to VS2019 in which I paused because my projects in VSCode were breaking.I did a system restore and when I tried to start VSCode I got a message saying my installation was corrupt. So I reinstalled to the latest version and now get this error.
A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found...
I found 3 extensions that needed updating so I do so but did not fix this problem. Do not know if I need to update the .Net Core since it looks like a version mismatch. It seems these updates are wreckless since they always cause thing to go wrong.s