Issues with Post & The Loop smart action

Hello, it’s my first post on this forum and sorry for my bad english.

I have some issues with “Post & The Loop” smart action.
I follow a video “Post & The Loop Part 3” in Tutoriel section for WP but my post are not showing and I get a PHP error.

I set “Query Post Type” to “post”. It show one post and get error

ps: I currently have two articles but the second is not displayed.
Any help please ?