Solved!
I tried using a NEW "The Sims 3" set.
I copied and pasted my original The Sims 3 folder (or you can rename it).
Started a new game which created a fresh "The Sims 3" folder.
I added the require NRass files to the Mods folder in the new folder.
Started CAW and then opened up the Edit In Game and added the sims I wanted. (makesim and then porter).
Saved it and then exported the world with no problem.
I then renamed the "work" folder ("The Sims 3 - CAW_Folder"). and renamed my original folder back to "The Sims 3".
All my prior games and families were intact and I imported the new world file to the original folder and voila. It all worked!