I recently transitioned from LanguageClient-neovim to built-in lsp support and completion using omnifunc. However I was enticed by the promise of auto-imports and completion snippets including function arguments, so I've been trying to integrate nvim-cmp. It requires a snippet engine so I installed vsnip, which seems to be working fine. However autocomplete is not working.

No matter what I do, it won't recognize any of the completion sources I try to install.

I don't see any errors at any point, it just seems to be silently failing; autocomplete does not appear when I type.

Here is the output from running CmpStatus:

# unknown source names
- nvim_lsp

I'm not sure what other debugging options are available to me at this point other than print-debugging the cmp plugin.

I have installed the following relevant plugins using pathogen:

  • cmp-nvim-lsp
  • cmp-vsnip
  • nvim-cmp
  • nvim-lspconfig
  • vim-vsnip
  • vim-vsnip-integ

I have gradually pared down my config file to a (hopefully reasonably) minimal representation, including removing all of the sources and mappings I tried to configure for nvim-cmp except lsp support:

syntax on

filetype plugin indent on

set runtimepath=$HOME/.config/vim,$VIMRUNTIME

execute pathogen#infect()
execute pathogen#helptags()

map / <leader>

" lsp """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
if has('nvim')
lua << EOF

vim.o.completeopt = 'menu,menuone,noselect'

local nvim_lsp = require('lspconfig')

local cmp = require('cmp')

        snippet = {
                expand = function(args)
        mapping = {
                --['<C-d>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
                --['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
                --['<C-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
                --['<C-y>'] = cmp.config.disable, -- Specify `cmp.config.disable` if you want to remove the default `<C-y>` mapping.
                --['<C-e>'] = cmp.mapping({
                --      i = cmp.mapping.abort(),
                --      c = cmp.mapping.close(),
                --['<CR>'] = cmp.mapping.confirm({ select = true }),
        sources = cmp.config.sources({
                { name = 'nvim_lsp' },

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)

local servers = { 'metals', 'tsserver', 'rls', 'vimls' }
for _, lsp in ipairs(servers) do
        nvim_lsp[lsp].setup {
                capabilities = capabilities,

" end lsp """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

Here is the output from nvim --version:

:$ nvim --version
NVIM v0.5.0
Build type: Release
LuaJIT 2.1.0-beta3
Compilation: clang -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_TS_HAS_SET_MATCH_LIMIT -O2 -DNDEBUG -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/tmp/neovim-20210702-21950-fs4dxz/neovim-0.5.0/build/config -I/tmp/neovim-20210702-21950-fs4dxz/neovim-0.5.0/src -I/usr/local/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include -I/usr/local/opt/gettext/include -I/tmp/neovim-20210702-21950-fs4dxz/neovim-0.5.0/build/src/nvim/auto -I/tmp/neovim-20210702-21950-fs4dxz/neovim-0.5.0/build/include
Compiled by brew@iMac-Pro

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/local/Cellar/neovim/0.5.0/share/nvim"

Run :checkhealth for more info
  • 1
    My first thought would be to check the plugin docs or ask the plugin maintainers. They can probably guide you towards what you need or how to debug something.
    – D. Ben Knoble
    Nov 17, 2021 at 13:29

1 Answer 1


This turned out to be an issue with the way that the completion sources are structured. Pathogen is not able to load them. I resolved the issue by switching to packer.

  • 3
    Can you update your answer with the minimal structure you're using in packer? I'm getting the same error, with packer.
    – Travis
    Jun 17 at 12:11

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