Hi there,
I’ve just encountered the very same issue, after installing and setting up the WPML plugin. What triggered the issue for me was that I enabled the “Copy content from English”.
Up to this point, I’ve followed all the steps for setting up the WPML plugin from Kriesi’s tutorial ,so I can’t figure out what I did wrong.
In the Avia Layout Builder it looked all right, so I updated my site and the above mentioned error message appeared on the live site under the menu.
I’ve just tried to see what happens if I delete the copied page (language option 2), and it worked, the error message has disappeared. Would love to know as well what the solution is…
Thanks for your suggestions in advance
István