Need help with flycheck and etc-sudoers-mode

[lester <lester29@gazeta.pl>]

I want to install `flycheck` together with 
https://github.com/emacsmirror/etc-sudoers-mode.

When I run gnu emacs, I get:

     Error (use-package): etc-sudoers-mode/:catch: Symbol’s value as 
variable is void: sudoers Disable showing Disable logging

Have you any ideas what could be wrong? Thanks

My `.emacs.d/init.el`:

     ;; use straight.el for package management
     (defvar bootstrap-version)
     (let ((bootstrap-file
            (expand-file-name "straight/repos/straight.el/bootstrap.el" 
user-emacs-directory))
           (bootstrap-version 6))
       (unless (file-exists-p bootstrap-file)
         (with-current-buffer
             (url-retrieve-synchronously
 
"https://raw.githubusercontent.com/radian-software/straight.el/develop/install.el"
              'silent 'inhibit-cookies)
           (goto-char (point-max))
           (eval-print-last-sexp)))
       (load bootstrap-file nil 'nomessage))

     ;; install use-package using straight.el
     (straight-use-package 'use-package)

     ;; configure use-package to use straight.el by default
     (use-package straight
       :custom
       (straight-use-package-by-default t))

     ;; disable startup screen
     (setq inhibit-startup-screen t)

     ;; disable menu bar, scroll bar, and tool bar
     (menu-bar-mode -1)
     (toggle-scroll-bar -1)
     (tool-bar-mode -1)

     ;; disable dialog boxes
     (setq use-dialog-box nil)

     ;; set custom color scheme
     (use-package doom-themes)
     (use-package doom-moonfly-theme
       :straight (:host github :repo "stackmystack/doom-moonfly-theme"
     		   :branch "master"))
     (load-theme 'doom-moonfly t)

     ;; set default font
     (set-face-attribute 'default nil
     		    :family "MesloLGS Nerd Font Mono"
     		    :height 130
     		    :weight 'normal
     		    :width 'normal)

     ;; always ask using y or n instead yes or no
     (defalias 'yes-or-no-p 'y-or-n-p)

     ;; disable annoying bell
     (setq ring-bell-function 'ignore)

     ;; auto close bracket insertion
     (electric-pair-mode 1)

     ;; display line numbers
     (require 'display-line-numbers)

     (defcustom display-line-numbers-exempt-modes
       '(vterm-mode eshell-mode shell-mode term-mode ansi-term-mode)
       "Major modes on which to disable line numbers."
       :group 'display-line-numbers
       :type 'list
       :version "green")

     (defun display-line-numbers--turn-on ()
       "Turn on line numbers except for certain major modes.
     Exempt major modes are defined in `display-line-numbers-exempt-modes'."
       (unless (or (minibufferp)
                   (member major-mode display-line-numbers-exempt-modes))
         (display-line-numbers-mode)))

     (global-display-line-numbers-mode)

     ;; C-x C-; is not properly handled in terminal emulator so let's
     ;; add custom key binding for toggling comments in line
     (defun toggle-comment-on-line ()
       "comment or uncomment current line"
       (interactive)
       (comment-or-uncomment-region (line-beginning-position) 
(line-end-position)))
     (global-set-key (kbd "C-c ;") #'toggle-comment-on-line)

     ;; change indentation level for languages with C-like syntax
     (setq-default c-basic-offset 4)

     ;; auto completion
     (use-package company)
     (add-hook 'after-init-hook 'global-company-mode)
     (setq company-minimum-prefix-length 1
           company-idle-delay 0.0) ;; default is 0.2

     ;; lsp mode
     ;(use-package lsp-mode)

     ;; flycheck
     (use-package flycheck)
     (add-hook 'after-init-hook #'global-flycheck-mode)

     ;; sudoers mode
     (use-package etc-sudoers-mode)

     ;; systemd mode
     (use-package systemd)