content of READ MORE not appearing

Hello, I created a read more button. The button itself appears, though when I click on it, the content doesn’t appear, it only reload the page…
This message also appear on top of the page : https://new.meditationaquebec.org/page-dacceuil/classes/prieres/?fb-edit=1
Any idea what’s wrong?

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