Emacs version: 26.3
Hello! I want use [yamllint][plugin] to see any errors in YAML files. When I install it and edit `~/.emacs` as follows:
```
(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
(add-hook 'yaml-mode-hook 'flymake-yamllint-setup)
(flymake-mode)
(package-initialize)
(when (version<= "26.0.50" emacs-version)
(global-display-line-numbers-mode))
(setq completion-styles '(basic partial-completion emacs22 substring))
;; Interface customization
(set-face-foreground 'default "#660066")
```
and open my test .yml file I obtain nothing except this error:
```
Warning (flymake): Disabling backend flymake-proc-legacy-flymake because (error Can’t find a suitable init function)
```
How to fix it? I don't understand why it happens. Also when I tried to setup keybindings for switching between several errors:
```
(define-key flymake-mode-map (kbd "M-n") 'flymake-goto-next-error)
(define-key flymake-mode-map (kbd "M-p") 'flymake-goto-prev-error)
```
I obtained another error:
```
Warning (initialization): An error occurred while loading ‘/home/emilyseville7cfg/.emacs’:
Symbol's value as variable is void: flymake-mode-map
To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file. Start Emacs with
the ‘--debug-init’ option to view a complete error backtrace.
```
It's strange because [documentation][docs] provides exactly these Lisp expressions. What am I missing?
[See my issue for more details on GitHub][issue]
[plugin]: https://github.com/shaohme/flymake-yamllint
[docs]: https://www.gnu.org/software/emacs/manual/html_mono/flymake.html#Finding-diagnostics
[issue]: https://github.com/shaohme/flymake-yamllint/issues/3