When I remove the Shortcode. The error does go away.
The file list does not need to interact with the menu in any way. Are you saying that the presence of the menu on the page makes the error message appear?
The menu appears on all pages of the site. Do you think it would help to suppress the menu for that page? Because in the context of the file list page, it is not really needed.
Problem is I am not sure how to suppress it. Is there an easy CSS code that might help me accomplish that?
Thanks
Greg