Changing Highlight Colors for ALE Comments and Errors

[GrassiColas]

Hello everyone, I am a new ALE and Vim user. I have read the ALE documentation, but I don't understand why when I try to change the highlight of ALE comments, warnings, and errors, nothing happens.

I tried to add the following lines to my .vimrc :
highlight ALEVirtualTextError ctermfg=red
highlight ALEVirtualTextWarning ctermfg=yellow
highlight ALEWarning g:terminal_color_2
highlight ALEError g:terminal_color_1

, but nothing changed:

I tries also this command also after a reddit post but this not work :
autocmd ColorScheme * highlight ALEVirtualTextError ctermfg=red
autocmd ColorScheme * highlight ALEVirtualTextWarning ctermfg=yellow

I use a MacVim with no colorscheme.
link of reddit post : https://www.reddit.com/r/vim/comments/1br0fgx/changing_highlight_colors_for_ale_comments_and/

[GrassiColas]

I success to change color comment with this coment on my .vimrc file
autocmd ColorScheme * highlight ALEVirtualTextError guifg=#FF0000

I use macvim so may be the problem it's here because before I use cterm color