No 'Theme Options' tab after export

I’ve just tried giving this plugin a whirl but can’t seem to export my options table successfully.

I’ve exported my options to theme-options.php and uploaded to my theme’s root directory.

I have also added include_once('theme-options.php'); to the top of functions.php

However when I look under the Appearance tab I see no ‘Theme Options’ tab?

Also note that I have the Optiontree plugin disabled as I wish to have my own theme options file associated with my theme.

https://www.ads-software.com/extend/plugins/option-tree/