I saw this PHP notice for the first time, and a quick form search didn't turn up a match:
Notice: Function Elementor\Controls_Manager::add_control_to_stack was called incorrectly. Cannot redeclare control with same name "meta_box_skin_group_columns". Please see Debugging in WordPress for more information. (This message was added in version 1.0.0.) in /var/www/mysite/public/wp-includes/functions.php on line 5905
It was repeated for dozens (at least) of controls.
Can you please share some lines of error message below the notice the error? If you have the single plugin MB Elementor Integrator and Meta Box AIO activated, please deactivate the single plugin and recheck this issue.