monster.vim - failed async completion

[jtmkrueger]

I'm using deoplete, and I added vimproc to my list of plugins and ran make in the directory. I'm not sure what I can do to debug this and see what's actually going wrong. When I try and do the completion sequence, I get monster.vim - failed async completion in the status line. Anyone have a method to debug this and figure out what I've done wrong?

Here's what I added to my neovim init.vim

Plugin 'Shougo/vimproc.vim'
Plugin 'Shougo/deoplete.nvim'
Plugin 'osyo-manga/vim-monster'

...

" enables monster.vim async
let g:monster#completion#rcodetools#backend = "async_rct_complete"

" deoplete
let g:deoplete#enable_at_startup = 1
let g:deoplete#enable_smart_case = 1
let g:deoplete#enable_refresh_always = 1
inoremap <expr><TAB> pumvisible() ? "\<C-n>" : "\<TAB>"
let g:deoplete#sources#omni#input_patterns = {
\   "ruby" : '[^. *\t]\.\w*\|\h\w*::',
\}

I use vundle to do my package management.

[kabasakalis]

I get the same error, installed all dependencies as indicated, rcodetools etc. My neovim has perfect health.
I think README file must have more detailed instructions.

[dezza]

I have this problem on MacOS also. Last time I got it working it was on WSL (Ubuntu on Windows) and that's not more than 6 months to 1 year ago. I guess there could be an issue with either a /tmp dir on MacOS or a different problem.