LSP mode does not work

[diegovskytl]

Describe the bug
LSP mode does not work, getting error message.

To Reproduce
Steps to reproduce the behavior:

1. Install extension and nimlangserver with nimble
2. Extension settings -> Nim: Provider -> Select lsp
3. Open Nim file
4. This message pops up:
   

Expected behavior
Message when server starts: (screenshot taken from saem's forked extension)

Cloned the repo and trying to work on it, but wanted to post here anyways.