Cannot assign an external or internal ip addresses to Network Objects table

I have just reloaded my sidewinder 5.2 and I am at the point where I need to start entering Network Objects so that I can start creating the ACLs. But when I try to add any external or DMZ IP address the Network objects table, I get an error message "This ip address is not an external address." For ex burbample, I have three zones 147.14.48.1 (internal burb),

Anyone know why, or experience this. This is a clean reload.

Rich