Traceback (most recent call last):
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/__init__.py", line 82, in completion_begin
    self.deoplete.gather_candidates(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 96, in gather_candidates
    results = self.gather_results(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 112, in gather_results
    cont['complete_position'] = source.get_complete_position(cont)
  File "/Users/zchee/.nvim/plugged/neco-vim/rplugin/python3/deoplete/sources/vim.py", line 38, in get_complete_position
    .format(context['input']))
  File "/usr/local/lib/python3.4/site-packages/neovim/api/nvim.py", line 125, in eval
    return self._session.request('vim_eval', string)
  File "/usr/local/lib/python3.4/site-packages/neovim/api/common.py", line 230, in request
    return walk(self._in, self._session.request(name, *args), self, name,
  File "/usr/local/lib/python3.4/site-packages/neovim/msgpack_rpc/session.py", line 81, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Failed to evaluate expression'
Traceback (most recent call last):
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/__init__.py", line 82, in completion_begin
    self.deoplete.gather_candidates(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 96, in gather_candidates
    results = self.gather_results(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 112, in gather_results
    cont['complete_position'] = source.get_complete_position(cont)
  File "/Users/zchee/.nvim/plugged/neco-vim/rplugin/python3/deoplete/sources/vim.py", line 38, in get_complete_position
    .format(context['input']))
  File "/usr/local/lib/python3.4/site-packages/neovim/api/nvim.py", line 125, in eval
    return self._session.request('vim_eval', string)
  File "/usr/local/lib/python3.4/site-packages/neovim/api/common.py", line 230, in request
    return walk(self._in, self._session.request(name, *args), self, name,
  File "/usr/local/lib/python3.4/site-packages/neovim/msgpack_rpc/session.py", line 81, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Failed to evaluate expression'
Traceback (most recent call last):
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/__init__.py", line 82, in completion_begin
    self.deoplete.gather_candidates(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 96, in gather_candidates
    results = self.gather_results(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 112, in gather_results
    cont['complete_position'] = source.get_complete_position(cont)
  File "/Users/zchee/.nvim/plugged/neco-vim/rplugin/python3/deoplete/sources/vim.py", line 38, in get_complete_position
    .format(context['input']))
  File "/usr/local/lib/python3.4/site-packages/neovim/api/nvim.py", line 125, in eval
    return self._session.request('vim_eval', string)
  File "/usr/local/lib/python3.4/site-packages/neovim/api/common.py", line 230, in request
    return walk(self._in, self._session.request(name, *args), self, name,
  File "/usr/local/lib/python3.4/site-packages/neovim/msgpack_rpc/session.py", line 81, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Failed to evaluate expression'
Traceback (most recent call last):
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/__init__.py", line 82, in completion_begin
    self.deoplete.gather_candidates(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 96, in gather_candidates
    results = self.gather_results(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 112, in gather_results
    cont['complete_position'] = source.get_complete_position(cont)
  File "/Users/zchee/.nvim/plugged/neco-vim/rplugin/python3/deoplete/sources/vim.py", line 38, in get_complete_position
    .format(context['input']))
  File "/usr/local/lib/python3.4/site-packages/neovim/api/nvim.py", line 125, in eval
    return self._session.request('vim_eval', string)
  File "/usr/local/lib/python3.4/site-packages/neovim/api/common.py", line 230, in request
    return walk(self._in, self._session.request(name, *args), self, name,
  File "/usr/local/lib/python3.4/site-packages/neovim/msgpack_rpc/session.py", line 81, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Failed to evaluate expression'
Traceback (most recent call last):
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/__init__.py", line 82, in completion_begin
    self.deoplete.gather_candidates(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 96, in gather_candidates
    results = self.gather_results(context)
  File "/Users/zchee/.nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/deoplete.py", line 112, in gather_results
    cont['complete_position'] = source.get_complete_position(cont)
  File "/Users/zchee/.nvim/plugged/neco-vim/rplugin/python3/deoplete/sources/vim.py", line 38, in get_complete_position
    .format(context['input']))
  File "/usr/local/lib/python3.4/site-packages/neovim/api/nvim.py", line 125, in eval
    return self._session.request('vim_eval', string)
  File "/usr/local/lib/python3.4/site-packages/neovim/api/common.py", line 230, in request
    return walk(self._in, self._session.request(name, *args), self, name,
  File "/usr/local/lib/python3.4/site-packages/neovim/msgpack_rpc/session.py", line 81, in request
    raise self.error_wrapper(err)
neovim.api.nvim.NvimError: b'Failed to evaluate expression'