This looks like you have a define on the Catalog but not on the Admin for:
/includes/extra_datafiles/order_status_filenames.php

Line #10 : define('FILENAME_ORDER_STATUS', 'order_status');
I am not familiar with what you are using on this, but it strikes me there needs to be the same define added to the:
/your_secret_admin_dir/includes/extra_datafiles

for that define ...

You may need other things as well but at least that one line is needed ...

You might want to review any installation instructions for whatever add on you are using ...