Hi Brad thank you for answering me.
I am usin Auros theme, and this theme have ours widgets like elementor pro, but also use basic elementor free plugin. I has a duplicate post inactive, but now, after your reply I deleted it.
I am using polylang and yes I have three configureds languages (portugués, Inglés and Espa?ol). I will wait to see if deleting inactive duplicate post plugin, the error notice disappears. ??
Thank you for all