“[lwptoc]” instead of the actual table of content in my sidebar

Hi! I do not know why but in the recent days, the table of content disappeared and just the shortcode, [lwptoc], is being displayed.

https://www.maisonae.fr/guide/les-7-commandements-pour-entretenir-son-taille-haie

I fail to see what’s going wrong in my page or what caused this to not work. Any idea? Would be appreciated.

Thanks!

The page I need help with: [log in to see the link]