Adding additional FiOS Static IPs to westell 9100em

[csda]

I am trying to add additional static IPS under My Network -> Network Connections-> Broadband Connection -> Advanced. Router is already set up with primary static IP. When I try to add an additional one using subnet mask 255.255.255.0, I get the following error: "Entered subnet conflicts with the subnet of another connection" How shoudl I enter the additional static IPs? Thanks.

[Hubrisnxs · Accepted solution]

for some reason the routers say that even though its a valid subnet.  so try to ignore the error and see if it adds it still.   

[csda]

IPs went through. Thanks.