attempt to index local 'ext' (a nil value)

[Erven2016]

Description

When create file or folder in nvim-tree:

E5108: Error executing lua: ...\pack\packer\start\nvim-tree.lua/lua/nvim-tree/utils.lua:180: attempt to index local 'ext' (a nil value)
stack traceback:
        ...\pack\packer\start\nvim-tree.lua/lua/nvim-tree/utils.lua:180: in function 'is_executable'
        ...er\start\nvim-tree.lua/lua/nvim-tree/explorer/reload.lua:67: in function 'reload'
        ...m-tree.lua/lua/nvim-tree/actions/reloaders/reloaders.lua:12: in function 'refresh_nodes'
        ...m-tree.lua/lua/nvim-tree/actions/reloaders/reloaders.lua:43: in function 'reload_explorer'
        ...t\nvim-tree.lua/lua/nvim-tree/actions/fs/create-file.lua:107: in function 'on_confirm'
        ...ools\neovim\nvim-win64\share\nvim\runtime/lua/vim/ui.lua:93: in function 'input'
        ...t\nvim-tree.lua/lua/nvim-tree/actions/fs/create-file.lua:64: in function 'handle_tree_actions'
        ...r\start\nvim-tree.lua/lua/nvim-tree/actions/dispatch.lua:120: in function 'dispatch'
        ...acker\start\nvim-tree.lua/lua/nvim-tree/actions/init.lua:258: in function <...acker\start\nvim-tree.lua/lua/nvim-tree/actions/init.lua:257>

Neovim version

NVIM v0.7.2
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compiled by runneradmin@fv-az276-503

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

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

Run :checkhealth for more info

Operating system and version

Windows 10

nvim-tree version

c964fa2

Minimal config

vim.cmd [[set runtimepath=$VIMRUNTIME]]
vim.cmd [[set packpath=/tmp/nvt-min/site]]
local package_root = "/tmp/nvt-min/site/pack"
local install_path = package_root .. "/packer/start/packer.nvim"
local function load_plugins()
  require("packer").startup {
    {
      "wbthomason/packer.nvim",
      "kyazdani42/nvim-tree.lua",
      "kyazdani42/nvim-web-devicons",
      -- ADD PLUGINS THAT ARE _NECESSARY_ FOR REPRODUCING THE ISSUE
    },
    config = {
      package_root = package_root,
      compile_path = install_path .. "/plugin/packer_compiled.lua",
      display = { non_interactive = true },
    },
  }
end

if vim.fn.isdirectory(install_path) == 0 then
  print "Installing nvim-tree and dependencies."
  vim.fn.system { "git", "clone", "--depth=1", "https://github.com/wbthomason/packer.nvim", install_path }
end
load_plugins()
require("packer").sync()
vim.cmd [[autocmd User PackerComplete ++once echo "Ready!" | lua setup()]]
vim.opt.termguicolors = true
vim.opt.cursorline = true

-- MODIFY NVIM-TREE SETTINGS THAT ARE _NECESSARY_ FOR REPRODUCING THE ISSUE
_G.setup = function()
  require("nvim-tree").setup {}
end

Steps to reproduce

1. creating a folder or file in nvim-tree.

Expected behavior

No response

Actual behavior

Error arises when creating a folder(used minimal config to test). Creating file also have same issue.

It seems that file or folder was created but can not refresh.