I updated my php and mysql and was still experiencing the same issue. With a little bit of work with my hosting company we located the problem. This is what they said:
Our engineers determined that the error was caused by line 717 of the file /wp-admin/edit-form-advanced.php, which is the following:
do_meta_boxes(null, ‘advanced’, $post);
It appears that the error is gone after this line is commented out. Please feel free to notify the maker of the theme “Alora” regarding this issue, as the issue is only limited to this theme (we have never encountered the same issue with any other WordPress websites we host).
I have yet to encounter any problem from taking this line out. Please let me know if this effects anything on your end.
Thank you for your time and effort and have a great day.