E906: not an open channel

[Linerre]

Hi there,

I met this E906: not an open channel error when opening *.vim files.

Full error message:

continuing in <SNR>29_Start
Error detected while processing BufRead Autocommands for "*"..function <SNR>14_OnOpen[6]..lsc#file#onOpen[11]..lsc#server#start[1]..<SNR>29_Start[26]..4[2]..15[4]..18[2]..20[2]..21[2]..22:
line    1:
E906: not an open channel

<SNR>14 is ~\vimfiles\plugged\vim-lsc\plugin\lsc.vim
<SNR>29 is ~\vimfiles\plugged\vim-lsc\autoload\lsc\server.vim

Basic info:

• OS: Windows10
• Vim version: VIM - Vi IMproved 8.2

I have:

1. installed vim-language-server with npm:
   

2. configured vim-language-server according to the Wiki; even simpler:

let g:lsc_server_commands = {
  \ 'python': {
  \   'name': 'python-LSP',
  \   'command': 'pyls',
  \   },
  \ 'vim': {
  \ 'name': 'VimL',
  \ 'command': 'vim-language-server --stdio',
  \ },
  \}
let g:lsc_auto_map = {
 \  'GoToDefinition': 'gd',
 \  'FindReferences': 'gr',
 \  'Rename': 'gR',
 \  'ShowHover': 'K',
 \  'FindCodeActions': 'ga',
 \  'Completion': 'omnifunc',
 \}
let g:lsc_enable_autocomplete  = v:false
let g:lsc_reference_highlights = v:true
let g:lsc_enable_diagnostics   = v:false
set completeopt=menu,menuone,preview,noinsert,noselect

If I run :echo LSCServerStatus() in Vim, it returns starting.
If I run vim-language-server --stdio from my terminal (PowerShell), no error at all.

How can I fix the problem? Any advice? Thanks. By the way, Python server works fine.

[Linerre]

Somehow, the vim-language-server suddenly starts working with vim-lsc as expected:

After I opened this issue, I did the following things (though I doubt any of them is special):

1. I completely disabled vim-lsc plugin by commenting out the plug line and its config file;
2. I switched to coc.nvim, but got another issue with the server (see the mentioned issue above)
3. I decided to disable coc.nvim too, and switch back to this plugin, because at least it is lightweight and implemented in pure Vimscript, which won me over in the first place.
4. Unommented the lsc related lines in my vim config and it started working.

I have no idea what happened. I'll keep an eye on this though. If I keep the config above and restart vim again, then the issue comes back. I am so confused.

[andrescuco]

I am having the same issue trying to initialize typescript-language-server. I have just the minimal config of

let g:lsc_server_commands = {'typescript': 'typescript-language-server --stdio'}

The same error as @Linerre appears when trying to open any typescript file. This doesn't happen with any other lsp vim plugin.