PavoThemes Mega Nav Issue - Help!

Hi,

I have just had a 2.0 Opencart pavotheme installed. As part of the package I get a mega nav module. The module seem pretty good. I have tried adding a few catergories along with the sample data and it seems to be working fine.

I have just tried to add categories away from the mega nav and it won't let me no matter what I do? I keep get a error message.

Also there are a number of categories that exist and that are not in the category area, should these two areas be sync up or I am just doing something completely wrong. can anyone shed any light on this?

Vic