Julia + Vscode: Error while communicating with the LS, no documented solution works

Tooling
1

When I use SHIFT+ENTER to execute a command in the editor, I get the Error message:
“Error while communicating with the LS. Check Output > Julia Language Server for additional information.”

After toggling “Print code in REPL”, if I mark the entire line I want to execute and press SHIFT+ENTER, the line executes perfectly well. But this is cumbersome. A related post suggested running “juliaup add release”, but juliaup triggers an “Undef” Error.

Is there anything I can do?

2

Reinstall juliaup?

On Linux:

rm -rf .juliaup
curl -fsSL https://install.julialang.org | sh

juliaup add release must work.

ufechner@ufryzen:~$ juliaup add release
    Checking for new Julia versions
'release' is already installed.
3

So what does that say?