admin allowed categories doesn't exist

While trying to add a new category in admin I get this message -

Array ( [categories_id] => 99 [admin_id] => 1 )
1146 Table 'scrappi1_zc2.TABLE_ADMIN_ALLOWED_CATEGORIES' doesn't exist
in:
[insert into TABLE_ADMIN_ALLOWED_CATEGORIES (categories_id, admin_id) values ('99', '1')]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

I have double checked phpmyadmin and that table definately exists. I did a db repair just in case, but no go.

I have had my cart for 3yrs, been through various upgrades with no issues. I'm currently running zen 1.3.8 with admin profiles mod but have had this configuration for well over 6mths. Where else should I be looking for a solution.

Thank you in advance for any help.

Issue fixed :: admin>categories.php was the culprit :: reinstalled orig file and problem solved.....yay me!

Thanks for the update that you were making a call for a table not part of Zen Cart from an Add-on and reloading the original files corrected the problems with the add-on ...