"no notification handler registered" error occurs if opens just one file and source is not specified

[yacut]

Steps to reproduce:

• Change source in your config: let g:far#source = 'agnvim'
• Go to a folder and open a file with nvim:

$ cd $HOME
$ nvim test

• Search for something:
  :F test .

Expected behavior:
The commands above opens Far Search with "test" results

Actual behavior:
The commands above throws the error: "no notification handler registered for "/home/xxx/.vim/plugged/far.vim/rplugin/python3/far:function:_far_nvim_rpc_async_invoke""

Workaround:
:F test . --source=ag

[brooth]

Isn't reproduced on my side (ubuntu 16.04, nvim 0.2.0-dev). Can you attach your OS, nvim versions?
Also, try to run this command (within neovim):

:UpdateRemotePlugins

If it doesn't help, then try to update nvim python client as well (within your shell):

pip3 install neovim --upgrade

[yacut]

I can unfortunately reproduce the issue on Mac OS (nvim 0.1.7) and Linux (also ubuntu 16.04, nvim 0.2.0-dev) machines:

$ uname -a
Darwin xxx 16.3.0 Darwin Kernel Version 16.3.0: Thu Nov 17 20:23:58 PST 2016; root:xnu-3789.31.2~1/RELEASE_X86_64 x86_64

All plugins and dependencies are up to date.

$ pip3 install neovim --upgrade
Requirement already up-to-date: neovim in ./Library/Python/3.6/lib/python/site-packages
Requirement already up-to-date: greenlet in /usr/local/lib/python3.6/site-packages (from neovim)
Requirement already up-to-date: msgpack-python>=0.4.0 in /usr/local/lib/python3.6/site-packages (from neovim)

Also remote plugins:

:UpgradeRemotePlugins
remote/host: python3 host registered plugins ['nvim-typescript', 'deoplete', 'far']
remote/host: generated rplugin manifest: /Users/xxx/.local/share/nvim/rplugin.vim

On Mac neovim installed via home brew:

:version
NVIM 0.1.7
Build type: RelWithDebInfo
Compilation: /usr/local/Homebrew/Library/Homebrew/shims/super/clang -Wconversion -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -g -DDISABLE_LOG -Wall -Wextra -pedantic -Wno-unused-pa
rameter -Wstrict-prototypes -std=gnu99 -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -DHAVE_CONFIG_H -I/tmp/neovim-20161214-85501-5qj5t
p/neovim-0.1.7/build/config -I/tmp/neovim-20161214-85501-5qj5tp/neovim-0.1.7/src -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/
include -I/usr/local/include -I/usr/local/opt/gettext/include -I/usr/include -I/usr/include -I/tmp/neovim-20161214-85501-5qj5tp/neovim-0.1.7/build/src/nvim/auto -I/tmp/neovim-201
61214-85501-5qj5tp/neovim-0.1.7/build/include

Optional features included (+) or not (-): +acl   +iconv    +jemalloc +tui
For differences from Vim, see :help vim-differences

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/local/Cellar/neovim/0.1.7/share/nvim"

I also noticed that if I open the NERDTree once then the following FAR commands will work without errors.

[turboladen]

FWIW, same issue here and I'm not using far.vim.

[megalithic]

any updates/fixes per chance? I'm experiencing this too (not using far.vim).

[brooth]

Obviously it's not related to far.vim