Minecraft Server Error

I have been trying to make a Minecraft Server for my friends and I. However, when I try to apply the changes, it tells me that my LAN IP is invalid. I followed the instructions here:

http://portforward.com/english/routers/port_forwarding/Belkin/F9K1003v1/Minecraft_Server.htm

Does anyone know how I can fix this? Thanks in advance!
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