Fatal PHP : class Markdownify does not have a method "flushStacked_ul"

Bonjour
Fatal error:  Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class Markdownify does not have a method "flushStacked_ul" in /home/bldtnew/www/Om/plugins/auto/facteur/v5.2.0/lib/markdownify/markdownify.php:392
Stack trace:
#0 /home/bldtnew/www/Om/plugins/auto/facteur/v5.2.0/lib/markdownify/markdownify.php(338): Markdownify->flushStacked()
#1 /home/bldtnew/www/Om/plugins/auto/facteur/v5.2.0/lib/markdownify/markdownify.php(152): Markdownify->parse()
#2 /home/bldtnew/www/Om/plugins/auto/facteur/v5.2.0/inc/facteur_mail_html2text.php(88): Markdownify->parseString('\n\n\n\n\n\t\n\n\n\n<p><a...')
#3 /home/bldtnew/www/Om/plugins/auto/facteur/v5.2.0/facteur_fonctions.php(98): inc_facteur_mail_html2text_dist('\n\n\n\n\n\t\n\n\n\n<p><a...')
#4 /home/bldtnew/www/Om/plugins/auto/clevermail/v3.2.0/inc/clevermail_post_create.php(66): facteur_mail_html2text('<HTML>\n<HEAD>\n<...')
#5 /home/bldtnew/www/Om/plugins/auto/clevermail/v3.2.0/action/clevermail_post_create.php(10): clevermail_post_create(4)
#6 /home/bldtnew/www/Om/ecrire/public/aiguiller.php(80): action_clevermail_post_create_dist()
#7 /home/bldtnew/www/Om/ecrire/index.php(66): traiter_appels_actions()
#8 {main}
  thrown in /home/bldtnew/www/Om/plugins/auto/facteur/v5.2.0/lib/markdownify/markdownify.php on line 392
SPIP 4.3.6
PHP Version 8.3.9
Facteur 5.2.0