Can't start mpfls client on VScode.

[badaxi]

Using the built in extensions in VScode and after installation, when enabling the extension an error message occurs :

[Error - 23:41:06] Starting client failed
Launching server using command mpfls failed.

I have tried multiple things already, all my versions are up to date, the extension simply doesn't load.

[mattkemp]

Are you launching Visual Code by typing code . from a command prompt in the working directory?

I don't know why this is different from just opening Visual Code normally, but it got the language server running for me.

[gbouthenot]

Probably because mpf-ls has been installed into a virtualenv ?
When code call code . while being in the vitrtualenv, the vs extension can launch mpf-ls.
If you call code externally, the virtualenv is not activated and hence, mpf-ls cannot launch ?