Not Authorised error in order editing

Dear OC

I had hired a developer to make some customization in my website and i'm using OC 2.0.3.1. He had completed the customization and from here onwards i'm getting an error like "Not Authorized" prompt box when i try to edit the order and save it. I checked all the options in Users > user Groups > Top Administrators and saved but still getting the same error.

Can anyone help me please

In your PHPMyAdmin, truncate your oc_usergroup table from your Opencart database and re-insert the values provided from the Opencart ZIP file on the install/opencart.sql for that table. Paste it in your SQL tab and execute the query. Clear all browser's cache by ensuring you are logged out from the Opencart admin before executing this query.

Note: Replace oc_ with your database table prefix name if using another one.

This should rectify the issue.