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Error on startup with gtags enabled

See original GitHub issue

vim or neovim?
- vim
- neovim
Output of vim --version or nvim --version:

NVIM v0.5.0-397-g96059d72e
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/gcc-5 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -g -Og -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -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/home/travis/build/neovim/bot-ci/build/neovim/build/config -I/home/travis/build/neovim/bot-ci/build/neovim/src -I/home/travis/build/neovim/bot-ci/build/neovim/.deps/usr/include -I/usr/include -I/home/travis/build/neovim/bot-ci/build/neovim/build/src/nvim/auto -I/home/travis/build/neovim/bot-ci/build/neovim/build/include
Compiled by travis@travis-job-13ebc8c2-4f6f-45b7-ad53-0dc3d8813d5f

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

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/share/nvim"

Output of :echo has("python"): 1
Output of :echo has("python3"): 1
Output of :py print(sys.version): 2.7.17 (default, Oct 22 2019, 09:14:09) [GCC 9.2.0]
Output of :py3 print(sys.version): 3.8.1 (default, Jan 22 2020, 06:38:00) [GCC 9.2.0]
Operating system:
- Linux (Arch Linux)
- Mac OS X
- Windows
- Etc.
Configurations related to LeaderF in vimrc:

let g:Lf_AutoResize = 1
let g:Lf_GtagsAutoGenerate = 1
let g:Lf_Gtagslabel = 'native-pygments'
let g:Lf_PreviewInPopup = 1
let g:Lf_WindowPosition = 'popup'
let g:Lf_WindowHeight = 0.30
let g:Lf_PopupWidth = 0.80
let g:Lf_RootMarkers = ['.project', '.projections.json', '.git', '.hg', '.svn',]
let g:Lf_JumpToExistingWindow = 1
let g:Lf_PopupShowStatusline = 0

Describe your question, feature request, or bug.

Bug, getting the following error output when starting Neovim:

|| Request from non-main thread.
|| Requests from different threads should be wrapped with nvim.async_call(cb, ...) 
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 468, in _update
||     root, dbpath, exists = self._root_dbpath(filename)
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 422, in _root_dbpath
||     dbpath = self._generateDbpath(root)
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 398, in _generateDbpath
||     if lfEval("get(g:, 'Lf_GtagsStoreInProject', 0)") == '1':
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/plugin/script_host.py", line 207, in eval
||     obj = self.request("vim_eval", expr)
|| Request from non-main thread.
|| Requests from different threads should be wrapped with nvim.async_call(cb, ...) 
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 62, in _processTask
||     print(e)
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/plugin/script_host.py", line 186, in write
||     self.redirect_handler(data)
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/plugin/script_host.py", line 77, in <lambda>
||     sys.stdout = RedirectStream(lambda data: nvim.out_write(data))
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/api/nvim.py", line 396, in out_write
||     return self.request('nvim_out_write', msg, **kwargs)
|| Exception in thread Thread-1:
|| Traceback (most recent call last):
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 60, in _processTask
||     task()
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 468, in _update
||     root, dbpath, exists = self._root_dbpath(filename)
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 422, in _root_dbpath
||     dbpath = self._generateDbpath(root)
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 398, in _generateDbpath
||     if lfEval("get(g:, 'Lf_GtagsStoreInProject', 0)") == '1':
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/plugin/script_host.py", line 207, in eval
||     obj = self.request("vim_eval", expr)
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/api/nvim.py", line 178, in request
||     raise NvimError("request from non-main thread")
|| pynvim.api.common.NvimError: request from non-main thread
|| During handling of the above exception, another exception occurred:
|| Traceback (most recent call last):
||   File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
||     self.run()
||   File "/usr/lib/python3.8/threading.py", line 870, in run
||     self._target(*self._args, **self._kwargs)
||   File "/home/stephen/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/gtagsExpl.py", line 62, in _processTask
||     print(e)
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/plugin/script_host.py", line 186, in write
||     self.redirect_handler(data)
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/plugin/script_host.py", line 77, in <lambda>
||     sys.stdout = RedirectStream(lambda data: nvim.out_write(data))
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/api/nvim.py", line 396, in out_write
||     return self.request('nvim_out_write', msg, **kwargs)
||   File "/home/stephen/.local/lib/python3.8/site-packages/pynvim/api/nvim.py", line 178, in request
||     raise NvimError("request from non-main thread")
|| pynvim.api.common.NvimError: request from non-main thread