Vimpyter always shows empty notebook files on Windows 10 and neovim 0.4.4

[byteptr]

Hi to all,
I have installed Neovim 0.4.4 on windows 10 machine and then vimpyter pluging with no luck casuse this pluging shows empty screen. I already test as suggested in #19 to open "spaceless" filenames but the problem persists. Any ideas to get around the problem?
Thank you all in advance.

Im picking files from my local drive:

D:\code\python

Name of one of tested files with no luck:

fstring.ipynb

All of my jupyter notebook files are created and edited from Chrome navigator, I also tried to edit from Edge, but this seems unrelated because the problem persists.

System Info

C:\Users\Utilisateur>notedown --version
1.5.1

Windows build: 19043.985

I try with :PlugUpdate as suggested in #5 , here is the output:

[===========]

- Finishing ... Done!
- fzf: Already up to date.
- nvim-fugitive: Already up to date.
- vim-github-dashboard: Already up to date.
- vimpyter: Already up to date.
- onedark.vim: Already up to date.
- vim-airline: Already up to date.
- vim-airline-themes: Already up to date.
- vim-easy-align: Already up to date.
- nerdtree: Already up to date.
- fzf.vim: Already up to date.
- coc.nvim: Already up to date.

I ran these commands to diagnose:

:messages

nothing.

:PlugStatus

[===========]
- fzf: OK
- nvim-fugitive: OK
- vim-easy-align: OK
- onedark.vim: OK
- vim-github-dashboard: OK
- vim-airline-themes: OK
- vim-airline: OK
- vimpyter: OK
- nerdtree: OK (not loaded)
- fzf.vim: OK
- coc.nvim: OK

---

:checkhealth

========================================================================
  - OK: Environment check passed

  - OK: Javascript bundle build/index.js found
  - OK: Service started

health#nvim#check
========================================================================
## Configuration
  - OK: no issues found

## Performance
  - OK: Build type: RelWithDebInfo

## Remote Plugins
  - OK: Up to date

health#provider#check
========================================================================
## Clipboard (optional)
  - OK: Clipboard tool found: win32yank

## Python 2 provider (optional)
  - WARNING: No Python executable found that can `import neovim`. Using the first available executable for diagnostics.
  - ERROR: Python provider error:
    - ADVICE:
      - provider/pythonx: Could not load Python 2:
          python2 not found in search path or not executable.
          python2.7 not found in search path or not executable.
          python2.6 not found in search path or not executable.
          C:\Python38\python.EXE is Python 3.8 and cannot provide Python 2.
  - INFO: Executable: Not found

## Python 3 provider (optional)
  - INFO: `g:python3_host_prog` is not set.  Searching for python in the environment.
  - INFO: Multiple python executables found.  Set `g:python3_host_prog` to avoid surprises.
  - INFO: Executable: C:\Python38\python.EXE
  - INFO: Other python executable: C:/Python38/python
  - INFO: Other python executable: /python
  - INFO: Python version: 3.8.2
  - INFO: pynvim version: 0.4.3
  - OK: Latest pynvim is installed.

## Ruby provider (optional)
  - INFO: Ruby: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x64-mingw32]
  - WARNING: `neovim-ruby-host` not found.
    - ADVICE:
      - Run `gem install neovim` to ensure the neovim RubyGem is installed.
      - Run `gem environment` to ensure the gem bin directory is in $PATH.
      - If you are using rvm/rbenv/chruby, try "rehashing".
      - See :help |g:ruby_host_prog| for non-standard gem installations.

## Node.js provider (optional)
  - INFO: Node.js: v12.16.3
  - INFO: Neovim node.js host: C:\Users\Utilisateur\AppData\Roaming\npm\node_modules/neovim/bin/cli.js
  - OK: Latest "neovim" npm/yarn package is installed: 4.10.0

---

My init.vim file:

" - For Neovim: stdpath('data') . '/plugged'
" - Avoid using standard Vim directory names like 'plugin'
call plug#begin('~/.vim/plugged')
" Plugin outside ~/.vim/plugged with post-update hook
"
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'junegunn/fzf.vim'
Plug 'joshdick/onedark.vim'
Plug 'doronbehar/nvim-fugitive'
Plug 'https://github.com/junegunn/vim-github-dashboard.git'
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'
Plug 'junegunn/vim-easy-align'
Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'szymonmaszke/vimpyter' 
autocmd Filetype ipynb nmap <silent><Leader>b :VimpyterInsertPythonBlock<CR>
autocmd Filetype ipynb nmap <silent><Leader>j :VimpyterStartJupyter<CR>
autocmd Filetype ipynb nmap <silent><Leader>n :VimpyterStartNteract<CR>
call plug#end()
let g:newtr_keepdir=0
set rnu
cd d:/code

[grchristensen]

I'm really late here but is this related to #26? What's the output of running

notedown --to markdown fstring.ipynb