InvalidParameterException - Deleted user from admin - now getting error in "User Administration"

To repro:

1. I created a regular user
2. as admin i deleted the user
3. I went to register page and entered the same name for the user to register again
4. Now I can't get to the user administration page i get error:

InvalidParameterException

All files must have an owner!

Has anyone else seen this? Any advice on how to get User Admin page to work again?