You might be able to fix it by manually using phpMyAdmin to edit your admin user record in your admin table and setting the admin_profile value to a valid number, such as 1. Then once you're logged in, you can use the Admin Access menu to set permissions for all your users in a more correct way.
USE WITH CAUTION. You should never be manually editing data in phpMyAdmin unless you already have very strong understanding of MySQL, databases, and the Zen Cart database structure.
If making that edit "fixes" your present problem, YOU SHOULD STILL REPORT THE PROBLEM TO Fantastico
https://netenberg.com/#customer.html, and you should tell your hosting company to upgrade their Fantastico stuff to the latest version since it's probably out of date.
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